Income Statement [Table] Income Statement [Table] ARO Assets [Domain] ARO Assets [Domain] [Domain] for ARO Assets [Axis] General and administrative Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Reconciliation of net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Income tax expense Income Tax Expense (Benefit) Operations and Organization Nature of Operations [Text Block] Income Statement [Abstract] Income Statement [Abstract] Entity Filer Category Entity Filer Category Entity Address, Postal Zip Code Entity Address, Postal Zip Code Related Party Transaction [Line Items] Related Party Transaction [Line Items] FINANCING ACTIVITIES: FINANCING ACTIVITIES: [Abstract] FINANCING ACTIVITIES: [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Note payable to related company Notes Payable, Related Parties, Noncurrent Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Commitments and contingencies Commitments and Contingencies Investments, Fair Value Disclosure Investments, Fair Value Disclosure Description of the Business Description of the Business [Line Items] Description of the Business [Line Items] Transportation and storage of natural gas Revenue from Contract with Customer, Including Assessed Tax Entity Registrant Name Entity Registrant Name Property, plant and equipment Property, Plant and Equipment, Gross Interest expense — related company Interest Expense, Related Party Interest Expense, Related Party Operating and maintenance Related Party Transaction, Expenses from Transactions with Related Party Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Accounts payable Accounts Payable and Accrued Liabilities, Current Entity Address, City or Town Entity Address, City or Town OPERATING EXPENSES: Operating Expenses [Abstract] Stockholders' Equity, Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Limited partner Limited Partner [Member] Property, Plant and Equipment, Net Property, Plant and Equipment, Net [Abstract] Investments [Domain] Investments [Domain] Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Accounting Standards Update [Axis] Accounting Standards Update [Axis] Panhandle [Member] Panhandle [Member] Panhandle [Member] Other Noncash Income (Expense) Other non-cash Other Noncash Income (Expense) Commitments and Contingencies Disclosure Commitments and Contingencies Disclosure [Text Block] Liabilities and Equity, Total Liabilities and Equity Entity File Number Entity File Number Current liabilities: Liabilities, Current [Abstract] Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] NET INCOME Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Related Party [Axis] Related Party [Axis] Non-cash activity - Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid General partnership interest Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Amendment Flag Amendment Flag Net cash flows used in investing activities Net Cash Provided by (Used in) Investing Activities Current Fiscal Year End Date Current Fiscal Year End Date Related company note activity Repayments of Related Party Debt Scenario [Axis] Scenario [Axis] Investment Type [Axis] Investment Type [Axis] Ownership [Axis] Ownership [Axis] Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Accounts payable to related companies Accounts Payable, Related Parties, Current COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent Use of Estimates, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Related Party Related Party [Domain] Entity Current Reporting Status Entity Current Reporting Status Total operating revenues Revenues Partners’ capital: Partners' Capital [Abstract] Total current liabilities Liabilities, Current Other current liabilities Other Liabilities, Current Other non-current assets, net Other Assets, Noncurrent Other current assets Other Assets, Current Operating revenues Revenue from Related Parties SUPPLEMENTAL INFORMATION: Supplemental Cash Flow Information [Abstract] Exchanges receivable Exchanges receivable Consists of natural gas and natural gas liquid delivery and receipt imbalances with others. For the midstream and intrastate segments, these amounts turn over monthly and are valued at market prices, which management believes approximates cost. For the interstate segment, natural gas imbalances, in-kind receivables and payables are recorded at the dollar weighted composite average of all current month gas transactions and dollar valued imbalances are recorded at contractual prices. Equity Securities [Member] Equity Securities [Member] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Operating and maintenance Operating Costs and Expenses Accrued Environmental Loss Contingencies, Noncurrent Accrued Environmental Loss Contingencies, Noncurrent Partners’ capital Limited Partners' Capital Account Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Entity Address, State or Province Entity Address, State or Province Regulatory Matters, Commitments, Contingencies And Environmental Liabilities [Abstract] Regulatory Matters, Commitments, Contingencies And Environmental Liabilities [Abstract] REGULATORY MATTERS, COMMITMENTS, CONTINGENCIES, AND ENVIRONMENTAL LIABILITIES [Abstract] Partner Capital Components [Domain] Partner Capital Components [Domain] OTHER INCOME (EXPENSE): Nonoperating Income (Expense) [Abstract] Equity Securities, FV-NI, Unrealized Gain (Loss) Equity Securities, FV-NI, Unrealized Gain (Loss) Related Party Transactions [table text block] Schedule of Related Party Transactions [Table Text Block] OTHER COMPREHENSIVE INCOME, NET OF TAX: Other Comprehensive Income (Loss), Net of Tax [Abstract] Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, Address Line One Entity Address, Address Line One Basis of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies [Text Block] Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Actuarial gain relating to postretirement benefit plans Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Stockholders' Equity, Other Stockholders' Equity, Other Product and Service [Axis] Product and Service [Axis] Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Ownership [Domain] Ownership [Domain] Interest expense, net Interest Expense Entity Interactive Data Current Entity Interactive Data Current Related Party Transaction [Domain] Related Party Transaction [Domain] Ownership Interest [Table] Ownership Interest [Table] Ownership Interest [Table] Exchanges payable Exchanges payable Consists of natural gas and natural gas liquid delivery and receipt imbalances with others. For the midstream and intrastate segments, these amounts turn over monthly and are value at market prices, which management believes approximates cost. For the interstate segment, natural gas imbalances, in-kind receivables and payables are recorded at the dollar weighted composite average of all current month gas transactions and dollar valued imbalances are recorded at contractual prices. Other, net Other Nonoperating Income (Expense) Available-for-sale Securities Available-for-Sale Securities [Member] Long-term debt Long-Term Debt, Excluding Current Maturities Limited partnership interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Entity Tax Identification Number Entity Tax Identification Number Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] INCOME BEFORE INCOME TAX EXPENSE Income (Loss) Attributable to Parent, before Tax Partners' Capital, Total Partners' Capital INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Statement [Table] Statement [Table] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Document Quarterly Report Document Quarterly Report Total current assets Assets, Current Current assets: Assets, Current [Abstract] Non-current operating lease liabilities Operating Lease, Liability, Noncurrent Document Type Document Type Entity Small Business Entity Small Business Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Other Commitments [Table] Other Commitments [Table] Related Party Transaction [Axis] Related Party Transaction [Axis] OPERATING REVENUES: Revenues [Abstract] Income Statement Income Statement [Line Items] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Entity Central Index Key Entity Central Index Key Scenario [Domain] Scenario [Domain] Product and Service [Domain] Product and Service [Domain] Entity Shell Company Entity Shell Company Related Party Transactions Related Party Transactions Disclosure [Text Block] Statement, Partner Capital Components [Axis] Partner Capital Components [Axis] Amortization of deferred financing fees Amortization of Debt Discount (Premium) ETO [Member] ETO [Member] ETO [Member] Document Fiscal Year Focus Document Fiscal Year Focus Estimated litigation liability Estimated Litigation Liability Accounting Standards Update [Domain] Accounting Standards Update [Domain] OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Accounts receivable from related companies Accounts Receivable, Related Parties, Current City Area Code City Area Code Statement Statement [Line Items] ASSETS Assets [Abstract] Increase (Decrease) in Other Operating Assets and Liabilities, Net Changes in operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Other Commitments [Line Items] Other Commitments [Line Items] Fixed Income Securities [Member] Fixed Income Securities [Member] General and administrative Selling, General and Administrative Expense Contingent Residual Support Agreement, Amount Contingent Residual Support Agreement, Amount Amount of senior notes of an affiliate, the Partnership has agreed to provide contingent residual support for. Document Period End Date Document Period End Date Total operating expenses Costs and Expenses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Product and Service, Other [Member] Product and Service, Other [Member] Natural Gas, US Regulated [Member] Natural Gas, US Regulated [Member] ARO Assets [Axis] ARO Assets [Axis] ARO Assets [Axis] Other non-current liabilities Other Liabilities, Noncurrent Total assets Assets Operational Gas Sales Operational Gas Sales [Member] Operational Gas Sales Document Transition Report Document Transition Report Local Phone Number Local Phone Number Payments to Acquire Property, Plant, and Equipment Capital expenditures Payments to Acquire Property, Plant, and Equipment OPERATING INCOME Operating Income (Loss) Liabilities and Equity [Abstract] Liabilities and Equity [Abstract] Net cash flows used in financing activities Net Cash Provided by (Used in) Financing Activities Inventories Inventory, Net