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Accumulated Other Comprehensive Income (Loss) - Components of the Company's AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, deferred taxes | $ (416) | $ (95) | $ (39)
Balance | 6,896 | 5,029 | 5,960
Change in value, deferred tax | 38 | (321) | (53)
Change in value | (130) | 1,118 | 184
Amounts reclassified to earnings, deferred taxes | 31 | 0 | (3)
Amounts reclassified to earnings | (107) | (1) | 13
Balance, deferred taxes | (347) | (416) | (95)
Balance | 9,324 | 6,896 | 5,029
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance | 175 | (942) | (1,139)
Balance | (62) | 175 | (942)
Deferred income taxes | 285 |  |
Pension and Other Postretirement Liabilities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, before tax | 626 | (847) | (1,102)
Change in value, before tax | (199) | 1,474 | 239
Amounts reclassified to earnings, before tax | (138) | (1) | 16
Balance, before tax | 289 | 626 | (847)
Investments and Other |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, before tax | (35) | 0 | 2
Change in value, before tax | 31 | (35) | (2)
Amounts reclassified to earnings, before tax | 0 | 0 | 0
Balance, before tax | $ (4) | $ (35) | $ 0

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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