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Asset Retirement Obligations (Changes to AROs) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Asset Retirement Obligations [Line Items] |  |
Increase in estimated cash flows due to revision in timing of expected cash flows | $ 48 |
Decrease in estimated cash flows due to revision in timing of expected cash flows | 125 |
Increase in cash flows associated with Milestone Unit 1 | 83 |
Cash flows charged within impairment of assets and other charges | 83 |
Cash flows charged within impairment of assets and other charges net of tax | $ 60 |
Useful life extension of estimated cash flows | 20 years |
Other Current Liabilities |  |
Asset Retirement Obligations [Line Items] |  |
Asset retirement obligations | $ 434 | $ 365

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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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