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Accumulated Other Comprehensive Loss - AOCI Activity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | $ 417 |
Other comprehensive income (loss) before reclassifications | (4) | $ 18
Amounts reclassified from accumulated other comprehensive loss | 15 | 12
Other comprehensive income | 11 | 30
Balance at end of period | 504 | 10,932
Defined Benefit Plan | Pension Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (1,045) | (985)
Other comprehensive income (loss) before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 20 | 17
Other comprehensive income | 20 | 17
Balance at end of period | (1,025) | (968)
Defined Benefit Plan | Post-Retirement Benefit Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | 276 | 308
Other comprehensive income (loss) before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | (5) | (5)
Other comprehensive income | (5) | (5)
Balance at end of period | 271 | 303
Foreign Currency Translation Adjustment and Other |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (41) | (422)
Other comprehensive income (loss) before reclassifications | (4) | 18
Amounts reclassified from accumulated other comprehensive loss | 0 | 0
Other comprehensive income | (4) | 18
Balance at end of period | (45) | (404)
Accumulated Other Comprehensive Loss |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (810) | (1,099)
Other comprehensive income | 11 | 30
Balance at end of period | $ (799) | $ (1,069)

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