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Accumulated Other Comprehensive Loss (AOCL) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (2,251) |  | $ (2,239) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (15) | $ 253 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 3 | 149 |  |
Tax cost related to unrealized currency translation adjustments other than translation of foreign denominated balance sheets | 68 | 64 |  |
Pension and other postretirement benefit adjustments, tax cost | 1 | 46 |  |
Accumulated Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated other comprehensive loss | (1,758) | (1,991) | (1,746) | $ (2,254)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (12) | 262 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 1 |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated other comprehensive loss | (494) | (418) | (494) | (557)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (3) | (9) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 3 | 148 |  |
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated other comprehensive loss | 1 | 1 | 1 | 1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 0 | 0 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 |  |
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (2,251) | $ (2,408) | $ (2,239) | $ (2,810)

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