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Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Equity [Abstract] |  |
Available-for-sale securities | $ 22 | $ 20
Foreign currency translation adjustment | (11) | (6)
Actuarial gain related to pensions and other postretirement benefits | 41 | 45
AOCI attributable to equity method investments | 12 | 14
Accumulated other comprehensive income | $ 64 | $ 73

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