Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Total capitalization Capitalization, Long-Term Debt and Equity Other current assets Other Current Assets [Member] Number of regulated distribution divisions Number Of Divisions, Regulated Distribution Represents the number of regulated distribution divisions. Schedule of Condensed Consolidated Balance Sheet Condensed Balance Sheet [Table Text Block] Commodity contracts Commodity Contract [Member] Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Deferred charges and other assets Other Noncurrent Assets [Member] Unsecured 6.20% Senior Notes, due November 2053 Unsecured 6.20% Senior Notes, Due November 2053 [Member] Unsecured 6.20% Senior Notes, Due November 2053 Tabular List, Table Tabular List [Table Text Block] Unsecured 5.75% Senior Notes, due October 2052 Unsecured 5.75% Senior Notes, Due October 2052 [Member] Unsecured 5.75% Senior Notes, Due October 2052 Basic Earnings Per Share Earnings Per Share, Basic [Abstract] Recently issued accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Supply Commitment [Axis] Supply Commitment [Axis] Term SOFR Secured Overnight Financing Rate (SOFR) [Member] Bonds Debt Securities [Member] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic net income per share (USD per share) Net income per share - Basic (USD per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Forward Contract Indexed to Issuer's Equity, Type [Domain] Forward Contract Indexed to Issuer's Equity, Type [Domain] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Commercial Paper Commercial Paper [Member] Revenue and Accounts Receivable Revenue from Contract with Customer [Text Block] Regulation Public Utilities Disclosure [Text Block] Contract term (in years) Long-Term Purchase Commitment, Period Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Regulatory excess deferred taxes, to be returned, tranche two Regulatory Excess Deferred Taxes, To Be Returned, Tranche Two [Member] Regulatory Excess Deferred Taxes, To Be Returned, Tranche Two Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Supply Commitment Supply Commitment [Member] Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Benefits Pension Plan [Member] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Cash dividends Dividends, Common Stock, Cash Shareholders’ equity Shareholders' equity, beginning balance Shareholders' equity, ending balance Equity, Attributable to Parent Recognition of gains in earnings due to settlements: Other Comprehensive Income (Loss), Net of Tax [Abstract] Number of fatalities under investigation Loss Contingency, Number of Fatalities Under Investigation Loss Contingency, Number of Fatalities Under Investigation Regulatory cost of removal obligation Regulatory Cost Of Removal Liability Noncurrent Regulatory Cost Of Removal Liability Noncurrent Insider Trading Policies and Procedures [Line Items] Common stock authorized (in shares) Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Public and other stock offerings (in shares) Shares issued (in shares) Stock Issued During Period, Shares, New Issues Current assets Assets, Current [Abstract] Total capitalization and liabilities Liabilities and Equity CAPITALIZATION AND LIABILITIES Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Maximum Maximum [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Securitized intangible asset, net (See Note 9) Securitized intangible asset, net Finite-Lived Intangible Assets, Net Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Concentration of Credit Risk Concentration Risk Disclosure [Text Block] Deferred gas costs Deferred Fuel Costs [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Unusual or Infrequent Item, or Both [Domain] Unusual or Infrequent Item, or Both [Domain] Debt and equity securities authorized for issuance Debt and Equity Securities, Authorized for Issuance The total dollar amount of debt and equity securities authorized to be issued. Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Debt and equity securities authorized for issuance value remaining Debt And Equity Securities, Available For Issuance The total dollar amount of debt and equity securities available to be issued. Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Depreciation and amortization expense Amortization expense Depreciation, Depletion and Amortization, Nonproduction Purchase commitment volume Derivative, Nonmonetary Notional Amount, Volume Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Carrying Values and Estimated Fair Values of Long-term Debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Deferred credits and other liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Regulatory Asset [Line Items] Regulatory Asset [Line Items] Operating Segments Operating Segments [Member] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line Of Credit Facility [Table] Line of Credit Facility [Table] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Texas TEXAS Schedule Of Regulatory Liabilities [Table] Regulated Operation, Regulatory Liability [Table] Regulatory mechanism threshold (in percentage) Regulatory Mechanism Threshold APT has a regulatory mechanism that requires that we share with its tariffed customers a set percentage, as determined through the rate case filings, of the difference between the total non-tariffed revenues earned during a test period and a revenue benchmark. Class of Stock [Line Items] Class of Stock [Line Items] Unsecured 1.50% Senior Notes, due January 2031 Unsecured 1.50% Senior Notes, Due January 2031 [Member] Unsecured 1.50% Senior Notes, Due January 2031 Deferred income taxes Deferred Income Tax Liabilities, Net Document Fiscal Period Focus (Q1,Q2,Q3,FY) Document Fiscal Period Focus Unsecured 5.50% Senior Notes, due June 2041 Unsecured 5.50% Senior Notes, Due June 2041 [Member] Unsecured 5.50% Senior Notes, due 2041 Unsecured 6.75% Debentures, due July 2028 Unsecured 6.75% Debentures, Due July 2028 [Member] Unsecured 6.75% Debentures, Due July 2028 Derivatives Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Cash flow hedges: Cash Flow Hedges [Abstract] Cash Flow Hedges [Abstract] Award Type Award Type [Axis] Schedule of Expected Deferred Gains (Losses) Recognition Schedule Of Expected Deferred Gains (Losses) Recognition [Table Text Block] Tabular disclosure of the expected recognition in earnings of the deferred losses recorded in accumulated other comprehensive gains/(losses) associated with cash flow hedges. Income Tax Contingency [Table] Income Tax Contingency [Table] Long-term debt Long-Term Debt Total assets Total assets Assets Regulatory excess deferred taxes Deferred Income Tax Charge [Member] Trading Symbol Trading Symbol Five Year Unsecured Revolving Credit Agreement, March 28, 2030 Five Year Unsecured Revolving Credit Agreement, Maturing On March 28, 2030 [Member] Five Year Unsecured Revolving Credit Agreement, Maturing On March 28, 2030 Geographical [Domain] Geographical [Domain] Regulatory Liability [Axis] Regulatory Liability [Axis] Stock-based compensation plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Property, plant and equipment Public Utilities, Property, Plant and Equipment, Plant in Service Forward Contract Indexed to Issuer's Equity [Table] Forward Contract Indexed to Issuer's Equity [Table] Other segment items Segment Reporting, Other Segment Item, Amount Unsecured 3.375% Senior Notes, due September 2049 Unsecured 3.375% Senior Notes, Due September 2049 [Member] Unsecured 3.375% Senior Notes, due September 2049 Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Value of shares authorized for issuance Sale of Stock, Value of Shares Authorized Sale of Stock, Value of Shares Authorized Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Regulatory Agency [Axis] Regulatory Agency [Axis] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Cash dividends per share (USD per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Cash collateral Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Fixed-Price Contracts Fixed-Price Contracts [Member] Fixed-Price Contracts Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Debt issuance cost Debt Issuance Costs, Net Schedule of Regulatory Assets Schedule of Regulatory Assets [Table Text Block] Restricted cash and cash equivalents Restricted Cash and Cash Equivalent Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Common stock outstanding (in shares) Common stock outstanding, beginning balance (in shares) Common stock outstanding, ending balance (in shares) Common Stock, Shares, Outstanding Current period provisions Accounts Receivable, Credit Loss Expense (Reversal) Securitized Utility Tariff Bonds Securitized Utility Tariff Bonds [Member] Securitized Utility Tariff Bonds PEO PEO [Member] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Retained Earnings Retained Earnings [Member] Increase (decrease) in fair value: Interest Rate Fair Value Hedges [Abstract] Effective rate (in percentage) Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income Statement [Abstract] Income Statement [Abstract] Cash and cash equivalents and restricted cash and cash equivalents Cash and cash equivalents and restricted cash and cash equivalents at beginning of period Cash and cash equivalents and restricted cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Financial instruments net assets Derivative Asset Income tax expense Income Tax Expense (Benefit) Interest rate spread Debt Instrument, Basis Spread on Variable Rate Sale of Stock [Domain] Sale of Stock [Domain] Unsecured 4.15% Senior Notes, due January 2043 Unsecured 4.15% Senior Notes, Due January 2043 [Member] Unsecured 4.15% Senior Notes, due 2043 APT annual adjustment mechanism Regulatory Clause Revenues Over Recovered [Member] Regulatory Clause Revenues Over Recovered [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated As Hedge Designated as Hedging Instrument [Member] Regulatory excess deferred taxes Change in Tax Rate, Deferred Tax Liability Change in Tax Rate, Deferred Tax Liability Product and Service [Domain] Product and Service [Domain] Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV [Axis] Long-term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] Unsecured 5.45% Senior Notes, due January 2056 Unsecured 5.45% Senior Notes, Due January 2056 [Member] Unsecured 5.45% Senior Notes, Due January 2056 Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Amortization and unrealized gains (losses) on interest rate agreements, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Pension and postretirement benefit costs Pension and Other Postretirement Plans Costs [Member] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Deferred tax liabilities, net Deferred Tax Liabilities, Net Cash Flows From Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Unsecured 3.00% Senior Notes, due June 2027 Unsecured 3.00% Senior Notes, Due June 2027 [Member] Unsecured 3.00% Senior Notes, Due June 2027 Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Jackson, Mississippi Jackson, Mississippi [Member] Jackson, Mississippi Debt agreement term (in years) Debt Instrument, Term Amortization of actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Subsequent Event Subsequent Event [Member] Alternative revenue program revenues Alternative Revenue Program Revenues Alternative Revenue Program Revenues includes WNA, Weather Normalization Adjustment, which is the program that minimizes the effects of weathers during specific periods of the year. Regulatory asset, maturity period (in years) Regulatory Asset, Maturity Period Regulatory Asset, Maturity Period Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Money market funds Money Market Funds [Member] Gross/net financial instruments, liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Unsecured 2.625% Senior Notes, due September 2029 Unsecured 2.625% Senior Notes, Due September 2029 [Member] Unsecured 2.625% Senior Notes, Due September 2029 Commercial Commercial Customers [Member] Commercial customers Equity Components [Axis] Equity Components [Axis] Nature of Business Nature of Operations [Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments (in segment) Number of Reportable Segments Original issue (premium) discount on unsecured senior notes and debentures Debt Instrument, Unamortized Discount (Premium), Net Cost basis Debt Securities, Available-for-Sale, Amortized Cost Return basis, term (in years) Deferred Tax Liability, Regulatory Excess, Return Term Deferred Tax Liability, Regulatory Excess, Return Term Securitization Variable Interest Entity Disclosure [Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Debt issuance costs Payments of Debt Issuance Costs Entity Address, State or Province Entity Address, State or Province Total debt and equity securities Debt And Equity Securities, Fair Value Disclosure Total Debt and equity securities Fair value measurements Fair Value Measurement, Policy [Policy Text Block] Total current liabilities Liabilities, Current Other Current Liabilities Other current liabilities Other Current Liabilities [Member] Derivative, by Nature [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Cash dividends paid Payments of Ordinary Dividends, Common Stock Other current assets Other Assets, Current Additional paid-in capital Additional Paid in Capital, Common Stock Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Interest rate agreements Other Comprehensive Income, Reclassification Adjustment On Interest Rate Agreements Included In Net Income, Net Of Tax Net of tax effect of the reclassification adjustment for accumulated gains and losses from interest rate agreements designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period. Net (gain) loss on settled interest rate agreements Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Document Fiscal Year Focus Document Fiscal Year Focus Basis of presentation Basis of Accounting, Policy [Policy Text Block] Distribution segment Distribution Distribution Segment [Member] The reportable segment, a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements, comprised of the regulated natural gas distribution and related sales operations. Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Shelf Registration Statement Shelf Registration Statement [Member] Shelf Registration Statement [Member] Repayment of long-term debt Repayments of Long-Term Debt Effective income tax rate (in percentage) Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Cash Flows From Operating Activities Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Industrial Industrial Customers [Member] Industrial customers Equity [Abstract] Equity [Abstract] Unsecured 5.45% Senior Notes, due October 2032 Unsecured 5.45% Senior Notes, Due October 2032 [Member] Unsecured 5.45% Senior Notes, Due October 2032 Operation and maintenance expense Operation and maintenance expense Other Selling, General and Administrative Expense Segment Information Segment Reporting Disclosure [Text Block] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Not Designated As Hedges: Not Designated as Hedging Instrument [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Current maturities of long-term debt Current maturities of long-term debt Long-Term Debt and Lease Obligation, Current Gas stored underground Energy Related Inventory, Gas Stored Underground Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Amortization and unrealized losses on interest rate agreements, net of tax Total other comprehensive income (loss) from hedging, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Outstanding commercial paper Commercial Paper Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Capital expenditures Capital expenditures Payments to Acquire Productive Assets Depreciation and amortization expense Depreciation, Depletion and Amortization Deferred charges and other assets Other Assets, Noncurrent Accrued interest Interest Payable, Current Transportation revenues Transportation Revenue [Member] Transportation Revenue [Member] Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Operating revenues Total operating revenues Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Percent of customers excluded (in percentage) Percent of Customers Whose Gas Cost Portion Of Bill Is Excluded From Allowance For Uncollectable Account Percent of Customers Whose Gas Cost Portion Of Bill Is Excluded From Allowance For Uncollectable Account Regulatory cost of removal obligation Removal Costs [Member] Regulatory Liabilities [Line Items] Regulatory Liability [Line Items] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Reconciliation of Changes in Stockholders Equity Schedule of Stockholders Equity [Table Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Regulatory excess deferred taxes, to be returned, tranche three Regulatory Excess Deferred Taxes, To Be Returned, Tranche Three [Member] Regulatory Excess Deferred Taxes, To Be Returned, Tranche Three Finance lease obligations Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Debt and equity securities activities, net Payments for (Proceeds from) Investments Contract netting Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Purchased gas cost Cost of Revenue, Net Cost of Revenue, Net Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other, net Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] Forward Contract Indexed to Issuer's Equity, Type [Axis] Forward Contract Indexed to Issuer's Equity, Type [Axis] ASSETS Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Retirement Benefits, Description [Abstract] Retirement Benefits, Description [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Deferred pipeline record collection costs Deferred Project Costs [Member] Shareholders' Equity [Table] Shareholders' Equity [Table] Shareholders' Equity Fair Value Measurements Fair Value Disclosures [Text Block] Interim Pension and Other Postretirement Benefit Plan Information Retirement Benefits [Text Block] Credit Facility [Domain] Credit Facility [Domain] Shareholders’ equity Equity, Attributable to Parent [Abstract] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Number of states with service areas Number of States in which Entity Operates Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Interest rate (in percentage) Debt Instrument, Interest Rate, Stated Percentage Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Amortization of prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Five Year Unsecured Revolving Credit Agreement Five Year Unsecured Revolving Credit Agreement [Member] Regulated Operations Five Year Unsecured Revolving Credit Agreement Gross/net financial instruments, assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Next twelve months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Extraordinary Gas Cost Asset Recoverable Gas Costs [Member] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Forward Sales Equity Agreement Maturing Quarter June 30, 2026 Forward Sales Equity Agreement Maturing Quarter June 30, 2026 [Member] Forward Sales Equity Agreement Maturing Quarter June 30, 2026 Taxes, other than income Taxes, Other Schedule of Long-term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Regulated Operations [Abstract] Document Quarterly Report Document Quarterly Report Total assets Assets, Fair Value Disclosure Long-term debt, fair value Fair Value Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Energy [Axis] Energy [Axis] Debt-to-total-capitalization ratio (in percentage) Ratio of Indebtedness to Net Capital Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Winter Storm Uri incremental costs Storm Costs [Member] National Transportation Safety Board National Transportation Safety Board [Member] National Transportation Safety Board Interest cost Defined Benefit Plan, Interest Cost Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Maximum debt-to-total-capitalization ratio (in percentage) Public Utilities, Approved Debt Capital Structure, Percentage Deferred credits and other liabilities Other Noncurrent Liabilities [Member] Restatement Determination Date: Restatement Determination Date [Axis] Stock-based compensation plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Non-PEO NEO Non-PEO NEO [Member] Allowance for credit losses Debt Securities, Available-for-Sale, Allowance for Credit Loss Regulatory excess deferred taxes, to be returned, tranche one Regulatory Excess Deferred Taxes, To Be Returned, Tranche One [Member] Regulatory Excess Deferred Taxes, To Be Returned, Tranche One Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Shares available (in shares) Forward Contract Indexed to Equity, Settlement, Number of Shares Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Amounts reclassified from accumulated other comprehensive income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Sale of Stock [Axis] Sale of Stock [Axis] System Safety and Integrity Riders System Safety and Integrity Riders [Member] System Safety and Integrity Riders Regulatory Asset [Axis] Regulatory Asset [Axis] Schedule of Regulatory Liabilities Schedule of Regulatory Liabilities [Table Text Block] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Effect of dilutive shares Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units Equity Awards Adjustments Equity Awards Adjustments [Member] Schedule of Forward Sales Agreements Schedule of Forward Contracts Indexed to Issuer's Equity [Table Text Block] Other Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Debt face amount Debt Instrument, Face Amount Unsecured 5.20% Senior Notes, due August 2035 Unsecured 5.20% Senior Notes, Due August 2035 [Member] Unsecured 5.20% Senior Notes, Due August 2035 Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Schedule of Allowance for Credit Loss Activity Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Energy [Domain] Energy [Domain] Net realized gains in AOCI Accumulated Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges Interest Rate Agreements, Realized Gain (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges Interest Rate Agreements, Realized Gain (Loss), Net of Tax Infrastructure mechanisms Infrastructure Mechanisms [Member] Costs associated with capital expenditures incurred pursuant to the risk-based program for the renewal or replacement of distribution facilities, including steel service lines, that would otherwise be charged to expense. These costs are included in allowable costs for rate making purposes and future revenue will be provided to permit recovery of such incurred costs. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Net unrealized holding gains (losses) on available-for-sale securities, tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Long-term debt, net Total long-term debt, net Long-Term Debt and Lease Obligation Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Long-term Purchase Commitment [Line Items] Long-Term Purchase Commitment [Line Items] Bond mutual funds Fixed Income Funds [Member] Financial Instruments [Domain] Financial Instruments [Domain] Net unrealized holding gains (losses) on available-for-sale securities, net of tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Segments [Domain] Segments [Domain] Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Statement of Financial Position Location, Balance [Domain] Statement of Financial Position Location, Balance [Domain] Supply Commitment Arrangement [Domain] Supply Commitment Arrangement [Domain] Minimum Minimum [Member] Available- for-Sale Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Earnings per share Earnings Per Share, Policy [Policy Text Block] Gas sales revenues Gas Sales Revenue [Member] Gas Sales Revenue [Member] Company Selected Measure Name Company Selected Measure Name Total long-term debt Long-Term Debt and Lease Obligation, Including Current Maturities Senior Notes Senior Notes [Member] Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Net assets / liabilities from risk management activities Increase (Decrease) in Commodity Contract Assets and Liabilities Short-term Contract with Customer Short-Term Contract with Customer [Member] Issuance of common stock through stock purchase and employee retirement plans Proceeds from Stock Plans Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Less: Debt, Current [Abstract] Income available to common shareholders Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Common stock, no par value (stated at $0.005 per share); 200,000,000 shares authorized; issued and outstanding: March 31, 2026 — 166,918,310 shares; September 30, 2025 — 161,568,384 shares Common Stock, Value, Issued Less: Income allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Number of credit facilities Number Of Credit Facilities Number Of Credit Facilities Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule Of Regulatory Assets [Table] Regulated Operation, Regulatory Asset [Table] Diluted weighted average shares outstanding (in shares) Diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Document Transition Report Document Transition Report Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Income Taxes Income Tax Disclosure [Text Block] Diluted Earnings Per Share Earnings Per Share, Diluted [Abstract] Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss Dilutive shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Avondale, Louisiana Avondale, Louisiana [Member] Avondale, Louisiana Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Schedule of Condensed Consolidated Statements of Comprehensive Income Condensed Statement of Comprehensive Income [Table Text Block] Forward Contract Indexed to Issuer's Equity [Line Items] Forward Contract Indexed to Issuer's Equity [Line Items] Document Type Document Type Significant Other Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Product and Service [Axis] Product and Service [Axis] Derivative, Name [Domain] Derivative Contract [Domain] Derivative Contract [Domain] Current maturities of securitized long-term debt (See Note 9) Current maturities of securitized long-term debt Securitized Long-Term Debt, Current Maturities Securitized Long-Term Debt, Current Maturities Net proceeds from equity issuances Proceeds from Issuance of Common Stock Revenues from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Less accumulated depreciation and amortization Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Total current assets Assets, Current Regulatory Agency [Domain] Regulatory Agency [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] $50 Million Bank Loan Agreement $50 Million Bank Loan Agreement [Member] $50 Million Bank Loan Agreement [Member] Regulatory Asset [Domain] Regulatory Asset [Domain] Purchase commitment volume Long-Term Purchase Commitment, Minimum Volume Required Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Securitized long-term debt (See Note 9) Securitized long-term debt Securitized Long Term Debt, Excluding Current Maturities Securitized Long Term Debt, Excluding Current Maturities Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Income available to common shareholders Income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] Forward Sales Equity Agreement Maturing Quarter December 31, 2026 Forward Sales Equity Agreement Maturing Quarter December 31, 2026 [Member] Forward Sales Equity Agreement Maturing Quarter December 31, 2026 Total other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Current liabilities Liabilities, Current [Abstract] Line Of Credit Facility [Line Items] Line of Credit Facility [Line Items] Geographical [Axis] Geographical [Axis] Net change in other operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Quoted Prices in Active Markets (Level 1) Fair Value, Inputs, Level 1 [Member] Outstanding borrowings Long-Term Line of Credit Miscellaneous revenues Miscellaneous Revenue [Member] Miscellaneous Revenue [Member] Repayment of securitized long-term debt by AEK Repayments of Long-Term Securitized Debt Repayments of Long-Term Securitized Debt Diluted net income per share (USD per share) Net income per share - Diluted (USD per share) Earnings Per Share, Diluted Interest rate agreements Other Comprehensive Income, Unrealized Gain (Loss) On Interest Rate Agreements Arising During Period, Net Of Tax Change in accumulated gains and losses from interest rate agreements designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Title of 12(b) Security Title of 12(b) Security AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Forward price (USD per share) Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Goodwill imapairment Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Unsecured 4.30% Senior Notes, due October 2048 Unsecured 4.30% Senior Notes, Due October 2048 [Member] Unsecured 4.30% Senior Notes, Due October 2048 Earnings Per Share [Abstract] Earnings Per Share [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Regulatory asset, authorized Regulatory Asset, Authorized Amount Regulatory Asset, Authorized Amount Unsecured 5.95% Senior Notes, due October 2034 Unsecured 5.95% Senior Notes, Due October 2034 [Member] Unsecured 5.95% Senior Notes, due 2034 Regulatory Liability [Domain] Regulatory Liability [Domain] Recoverable loss on reacquired debt Loss on Reacquired Debt [Member] Award Timing Disclosures [Line Items] Service cost Defined Benefit Plan, Service Cost Long-term debt Carrying Amount Long-Term Debt, Gross Recoveries of amounts previously written off Accounts Receivable, Allowance for Credit Loss, Recovery Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Shareholders' Equity Equity [Text Block] Accordion feature Line Of Credit Facility, Accordion Feature Monetary value of the accordion feature, the additional line of credit portion that could be borrowed against with the approval of the issuing banks. Net income Net income Net Income (Loss) Attributable to Parent Intersegment Eliminations Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Net property, plant and equipment Net property, plant and equipment Public Utilities, Property, Plant and Equipment, Net Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Number of customers serviced (over) Number Of Customers, Regulated Distribution Number Of Customers, Regulated Distribution Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Adoption Date Trading Arrangement Adoption Date Base Rate Base Rate [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Unsecured 5.90% Senior Notes, due November 2033 Unsecured 5.90% Senior Notes, Due November 2033 [Member] Unsecured 5.90% Senior Notes, Due November 2033 Entity Current Reporting Status Entity Current Reporting Status Unsecured 4.125% Senior Notes, due October 2044 Unsecured 4.125% Senior Notes, Due October 2044 [Member] Unsecured 4.125% Senior Notes, Due October 2044 Derivative [Line Items] Derivative [Line Items] Customer [Axis] Customer [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Operating income Operating Income (Loss) Thereafter Cash Flow Hedge Gain (Loss) To Be Reclassified After Twelve Months Cash Flow Hedge Gain (Loss) To Be Reclassified After Twelve Months Consolidated Entities [Domain] Consolidated Entities [Domain] Line of Credit Line of Credit [Member] Retained earnings Retained Earnings (Accumulated Deficit) Financial instruments gross liability Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Unusual or Infrequent Item, or Both [Axis] Unusual or Infrequent Item, or Both [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Hedging percent Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage Gas Purchases Gas Purchases [Member] Gas Purchases [Member] Unsecured 2.85% Senior Notes, due February 2052 Unsecured 2.85% Senior Notes, Due February 2052 [Member] Unsecured 2.85% Senior Notes, Due February 2052 Residential Residential Customers [Member] Residential customers Proceeds from issuance of long-term debt Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Interest Rate Agreement Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Total Cash Flow Hedge Gain (Loss) To Be Reclassified, Total Cash Flow Hedge Gain (Loss) To Be Reclassified, Total Retirement Plan Type [Axis] Retirement Plan Type [Axis] Other non-operating income Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Financial instruments net liability Derivative Liability Deferred income taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash Flows From Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Outstanding indebtedness Debt Instrument, Covenant Compliance, Default Provision, Indebtedness Threshold Debt Instrument, Covenant Compliance, Default Provision Trigger Amount Variable Rate [Domain] Variable Rate [Domain] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Equity securities Equity Securities, FV-NI, Current Operation and maintenance expense Other Selling, General and Administrative Expense, Adjusted Other Selling, General and Administrative Expense, Adjusted Long-term Contract with Customer Within Two To Three Years Long-term Contract with Customer Within Two To Three Years [Member] Long-term Contract with Customer Within Two To Three Years [Member] Unsecured 5.00% Senior Notes, due December 2054 Unsecured 5.00% Senior Notes, Due December 2054 [Member] Unsecured 5.00% Senior Notes, Due December 2054 Forward sales equity agreement, settlement in cash Net proceeds available Forward Contract Indexed to Equity, Settlement, Cash, Amount All Adjustments to Compensation All Adjustments to Compensation [Member] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Amendment Flag Amendment Flag Other Benefits Other Postretirement Benefits Plan [Member] At-The-Market At-The-Market [Member] At-The-Market [Member] Termination Date Trading Arrangement Termination Date Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Shareholders' Equity [Line Items] Shareholders' Equity [Line Items] Shareholders' Equity Basic weighted average shares outstanding (in shares) Basic weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Number of incidents investigated that occurred during period Loss Contingency, Number Of Incidents Investigated That Occurred During Period Loss Contingency, Number Of Incidents Investigated That Occurred During Period Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Financial instruments gross assets Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Other Other Regulatory Assets (Liabilities) [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Maximum borrowing capacity post accordion feature Line of Credit Facility, Maximum Borrowing Capacity With Accordion Feature Maximum available borrowing capacity under the credit facility with consideration of any additional committed line portions under the accordion feature that could be borrowed against with the approval of the issuing banks. Public authority and other Public Authority and Other Customers [Member] Public authority and other customers Entity Tax Identification Number Entity Tax Identification Number Write-offs charged against allowance Accounts Receivable, Allowance for Credit Loss, Writeoff Other revenues Regulated Operating Revenue, Other Forward Sales Equity Agreement Maturing Quarter March 31, 2027 Forward Sales Equity Agreement Maturing Quarter March 31, 2027 [Member] Forward Sales Equity Agreement Maturing Quarter March 31, 2027 Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock stated value (USD per share) Common Stock, Par or Stated Value Per Share Common stock issued (in shares) Common Stock, Shares, Issued Medium-term note Series A, 1995-1, 6.67%, due December 2025 Medium-term note Series A, 1995-1, 6.67%, Due December 2025 [Member] Medium-term note Series A, 1995-1, 6.67%, Due December 2025 Regulatory liabilities Regulatory Liability $1.5 Billion Revolving Credit Facility $1.5 Billion Revolving Credit Facility [Member] $1.5 Billion Revolving Credit Facility Equity available for issuance Sale of Stock, Value of Shares Available For Issuance Value of shares remaining available for issuance Regulatory assets Regulatory Asset Interest charges Interest expense, net Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Registered investment companies Equity Securities [Member] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Pipeline and storage segment Pipeline and Storage Pipeline and Storage Segment [Member] The reportable segment, a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements, comprised of the regulated pipeline and storage operations. Other current liabilities Other Liabilities, Current Unsecured 4.125% Senior Notes, due March 2049 Unsecured 4.125% Senior Notes, Due March 2049 [Member] Unsecured 4.125% Senior Notes, due March 2049 Public and other stock offerings Stock Issued During Period, Value, New Issues Statement [Line Items] Statement [Line Items] Variable Rate [Axis] Variable Rate [Axis] Consolidation Items [Axis] Consolidation Items [Axis] $50 Million Revolving Credit Facility $50 Million Revolving Credit Facility [Member] $50 Million Revolving Credit Facility [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Winter Storm Uri Winter Storm Uri [Member] Winter Storm Uri Common stock Common Stock [Member] Bonds Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation