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Accumulated Other Comprehensive Loss - AOCI Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ 417 | $ 10,374 |
Other comprehensive (loss) income before reclassifications | 30 | (122) |
Amounts reclassified from accumulated other comprehensive income (loss) | 57 | 411 |
Other comprehensive income | 87 | 289 | $ 1,059
Balance at end of period | 464 | 417 | 10,374
Defined Benefit Plans |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (769) | (677) |
Other comprehensive (loss) income before reclassifications | 29 | (121) |
Amounts reclassified from accumulated other comprehensive income (loss) | 57 | 29 |
Other comprehensive income | 86 | (92) |
Balance at end of period | (683) | (769) | (677)
Defined Benefit Plans | Pension Plans |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (1,045) | (985) |
Other comprehensive (loss) income before reclassifications | (34) | (110) |
Amounts reclassified from accumulated other comprehensive income (loss) | 76 | 50 |
Other comprehensive income | 42 | (60) |
Balance at end of period | (1,003) | (1,045) | (985)
Defined Benefit Plans | Post-Retirement Benefit Plans |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 276 | 308 |
Other comprehensive (loss) income before reclassifications | 63 | (11) |
Amounts reclassified from accumulated other comprehensive income (loss) | (19) | (21) |
Other comprehensive income | 44 | (32) |
Balance at end of period | 320 | 276 | 308
Foreign Currency Translation Adjustment and Other |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (41) | (422) |
Other comprehensive (loss) income before reclassifications | 1 | (1) |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 382 |
Other comprehensive income | 1 | 381 |
Balance at end of period | (40) | (41) | (422)
Total |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (810) | (1,099) | (2,158)
Other comprehensive income | 87 | 289 | 1,059
Balance at end of period | $ (723) | $ (810) | $ (1,099)

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