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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
The following table summarizes changes in the asset retirement obligations included in our accompanying consolidated balance sheets:
December 31,
20232022
(In millions)
Balance at beginning of period$204 $196 
Accretion expense12 12 
New obligations
22 2 
Settlements(7)(6)
Balance at end of period(a)
$231 $204 
(a)Balances at both December 31, 2023 and 2022 include $3 million included within “Other current liabilities” on our accompanying consolidated balance sheets.
Schedule of Other Intangibles
The following tables summarize our other intangible assets as of December 31, 2023 and 2022 and our amortization expense for the years ended December 31, 2023, 2022 and 2021: 
Weighted Average Amortization PeriodDecember 31,
20232022
(Years)(In millions)
Gross11.3$3,543 $3,382 
Accumulated amortization(1,586)(1,573)
Net carrying amount$1,957 $1,809 
December 31,
202320222021
(In millions)
Amortization expense$202 $253 $237 
Schedule of Estimated Amortization Expense for Other Intangibles
Our estimated amortization expense for our intangible assets for each of the next five fiscal years is:
20242025202620272028
(In millions)
Estimated amortization expenses$198 $193 $191 $191 $190 
Schedule of Regulatory Assets and Liabilities Table [Table Text Block]
The following table summarizes our regulatory asset and liability balances as of December 31, 2023 and 2022:
December 31,
20232022
(In millions)
Current regulatory assets$26 $73 
Non-current regulatory assets214 183 
Total regulatory assets(a)$240 $256 
Current regulatory liabilities$45 $50 
Non-current regulatory liabilities188 175 
Total regulatory liabilities(b)$233 $225 
(a)Regulatory assets as of December 31, 2023 include (i) $100 million of unamortized losses on disposal of assets; (ii) $43 million income tax gross up on equity AFUDC; and (iii) $97 million of other assets, including amounts related to fuel tracker arrangements. Approximately $138 million of the regulatory assets, with a weighted average remaining recovery period of 10 years, are recoverable without earning a return, including the income tax gross up on equity AFUDC for which there is an offsetting deferred income tax balance for FERC rate base purposes; therefore, it does not earn a return.
(b)Regulatory liabilities as of December 31, 2023 are comprised of customer prepayments to be credited to shippers or other over-collections that are expected to be returned to shippers or netted against under-collections over time. Approximately $104 million of the $188 million classified as non-current is expected to be credited to shippers over a remaining weighted average period of 13 years, while the remaining $84 million is not subject to a defined period.
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the allocation of net income available to shareholders of Class P common stock and participating securities:
Year Ended December 31,
202320222021
(In millions, except per share amounts)
Net Income Available to Stockholders$2,391 $2,548 $1,784 
Participating securities:
   Less: Net Income Allocated to Restricted stock awards(a)(14)(13)(14)
Net Income Allocated to Common Stockholders$2,377 $2,535 $1,770 
Basic Weighted Average Shares Outstanding2,234 2,258 2,266 
Basic Earnings Per Share$1.06 $1.12 $0.78 
(a)As of December 31, 2023, there were approximately 13 million restricted stock awards outstanding.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following maximum number of potential common stock equivalents are antidilutive and, accordingly, are excluded from the determination of diluted earnings per share. As we have no other common stock equivalents, our diluted earnings per share are the same as our basic earnings per share for all periods presented.
Year Ended December 31,
202320222021
(In millions on a weighted average basis)
Unvested restricted stock awards13 13 13 
Convertible trust preferred securities3 3 3