INCOME BEFORE INCOME TAX BENEFIT Income (Loss) Attributable to Parent, before Tax Income Statement [Table] Income Statement [Table] Document Type Document Type ARO Assets [Domain] ARO Assets [Domain] [Domain] for ARO Assets [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Other, net Other Nonoperating Income (Expense) Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Commitments and Contingencies Disclosure Commitments and Contingencies Disclosure [Text Block] Related Party [Axis] Related Party [Axis] Other Commitments [Line Items] Other Commitments [Line Items] Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net General and administrative Selling, General and Administrative Expense Total operating expenses Costs and Expenses Entity Tax Identification Number Entity Tax Identification Number FINANCING ACTIVITIES: FINANCING ACTIVITIES: [Abstract] FINANCING ACTIVITIES: [Abstract] Partner Capital Components [Domain] Partner Capital Components [Domain] NET INCOME Net income Net Income (Loss) Attributable to Parent Limited partnership interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Other Liabilities, Current Other Liabilities, Current Other non-current assets, net Other Assets, Noncurrent Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Operating and maintenance Related Party Transaction, Expenses from Transactions with Related Party Description of the Business Description of the Business [Line Items] Description of the Business [Line Items] Actuarial gain relating to postretirement benefit plans Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Accounts Payable, Related Parties, Current Accounts Payable, Related Parties, Current Limited partner Limited Partner [Member] Total assets Assets Related Party Transactions Related Party Transactions Disclosure [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Scenario [Axis] Scenario [Axis] Liabilities and Equity [Abstract] Liabilities and Equity [Abstract] Total current assets Assets, Current Current Fiscal Year End Date Current Fiscal Year End Date OPERATING EXPENSES: Operating Expenses [Abstract] Entity Interactive Data Current Entity Interactive Data Current OPERATING REVENUES: Revenues [Abstract] Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] OPERATING INCOME Operating Income (Loss) Liabilities, Current, Total Liabilities, Current Non-cash activity - Settlement of related company payables Deemed contribution from partners Partners' Capital Account, Contributions Document Fiscal Period Focus Document Fiscal Period Focus Available-for-sale Securities, Gross Unrealized Gain Available-for-sale Securities, Gross Unrealized Gain Interest expense, net Interest Expense Entity Registrant Name Entity Registrant Name Stockholders' Equity, Other Stockholders' Equity, Other Accrued Environmental Loss Contingencies, Noncurrent Accrued Environmental Loss Contingencies, Noncurrent Commitments and Contingencies Commitments and Contingencies Product and Service [Axis] Product and Service [Axis] ASSETS Assets [Abstract] Panhandle [Member] Panhandle [Member] Panhandle [Member] Investment Type [Axis] Investment Type [Axis] SUPPLEMENTAL INFORMATION: Supplemental Cash Flow Information [Abstract] General partnership interest Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Entity Address, State or Province Entity Address, State or Province Statement, Partner Capital Components [Axis] Partner Capital Components [Axis] Entity Filer Category Entity Filer Category Other Commitments [Table] Other Commitments [Table] Product and Service [Domain] Product and Service [Domain] Equity Securities [Member] Equity Securities [Member] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Accounting Standards Update [Axis] Accounting Standards Update [Axis] Notes Payable, Related Parties, Noncurrent Notes Payable, Related Parties, Noncurrent Changes in operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Long-term Debt and Lease Obligation Long-term Debt and Lease Obligation Entity Address, Postal Zip Code Entity Address, Postal Zip Code Senior Notes Senior Notes Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Related Party Transactions [table text block] Schedule of Related Party Transactions [Table Text Block] 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. OTHER COMPREHENSIVE INCOME, NET OF TAX Other Comprehensive Income (Loss), Net of Tax [Abstract] Document Transition Report Document Transition Report 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] Product and Service, Other [Member] Product and Service, Other [Member] Partners' Capital, Total Partners' Capital Related Party Transactions [Abstract] Related Party Transactions [Abstract] Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Other Liabilities, Noncurrent Other Liabilities, Noncurrent OTHER INCOME (EXPENSE): Nonoperating Income (Expense) [Abstract] Regulatory Matters, Commitments, Contingencies And Environmental Liabilities [Abstract] Regulatory Matters, Commitments, Contingencies And Environmental Liabilities [Abstract] REGULATORY MATTERS, COMMITMENTS, CONTINGENCIES, AND ENVIRONMENTAL LIABILITIES [Abstract] Other current assets Other Assets, Current Document Quarterly Report Document Quarterly Report Inventories Inventory, Net Ownership [Axis] Ownership [Axis] Natural Gas, US Regulated [Member] Natural Gas, US Regulated [Member] General and administrative Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Ownership [Domain] Ownership [Domain] Property, plant and equipment Property, Plant and Equipment, Gross Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Contingent Residual Support Agreement Contingent Residual Support Agreement [Member] Contingent Residual Support Agreement Partners' Capital Limited Partners' Capital Account Statement Statement [Line Items] Partners' Capital [Abstract] Partners' Capital [Abstract] Ownership Interest [Table] Ownership Interest [Table] Ownership Interest [Table] Stockholders' Equity, Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Deferred income taxes Increase (Decrease) in Deferred Income Taxes Total operating revenues Revenues Income tax expense Income Tax Expense (Benefit) Entity File Number Entity File Number 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. Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Statement [Table] Statement [Table] Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Local Phone Number Local Phone Number Net cash flows used in financing activities Net Cash Provided by (Used in) Financing Activities Use of Estimates, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Current assets: Assets, Current [Abstract] Transportation and storage of natural gas Revenue from Contract with Customer, Including Assessed Tax Entity Address, Address Line One Entity Address, Address Line One Investments, Fair Value Disclosure Investments, Fair Value Disclosure Entity Address, Address Line Two Entity Address, Address Line Two Entity Small Business Entity Small Business Document Fiscal Year Focus Document Fiscal Year Focus Related Party Transaction [Domain] Related Party Transaction [Domain] Entity Emerging Growth Company Entity Emerging Growth Company COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent Entity Current Reporting Status Entity Current Reporting Status Income Statement Income Statement [Line Items] Related Party Transaction [Axis] Related Party Transaction [Axis] Scenario [Domain] Scenario [Domain] Payments to Acquire Property, Plant, and Equipment Capital expenditures Payments to Acquire Property, Plant, and Equipment City Area Code City Area Code Amendment Flag Amendment Flag Operating and maintenance Operating Costs and Expenses Document Period End Date Document Period End Date Interest expense — related company Interest Expense, Related Party Interest Expense, Related Party ETO [Member] ETO [Member] ETO [Member] INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash and Cash Equivalents, at Carrying Value Estimated litigation liability Estimated Litigation Liability Net cash flows used in investing activities Net Cash Provided by (Used in) Investing Activities Accounts receivable from related companies Accounts Receivable, Related Parties, Current Related company note activity Repayments of Related Party Debt 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. Investments [Domain] Investments [Domain] Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Entity Central Index Key Entity Central Index Key Related Party Related Party [Domain] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Operating revenues Revenue from Related Parties Related Party Transaction [Line Items] Related Party Transaction [Line Items] Basis of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies [Text Block] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Operations and Organization Nature of Operations [Text Block] ARO Assets [Axis] ARO Assets [Axis] ARO Assets [Axis] Liabilities and Equity, Total Liabilities and Equity Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax Non-cash activity - Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid Entity Address, City or Town Entity Address, City or Town Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Liabilities, Current [Abstract] Liabilities, Current [Abstract] Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current Entity Shell Company Entity Shell Company Accounting Standards Update [Domain] Accounting Standards Update [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Property, Plant and Equipment, Net [Abstract] Property, Plant and Equipment, Net [Abstract] Fixed Income Securities [Member] Fixed Income Securities [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Other non-cash Other Noncash Income (Expense)