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Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Equity [Abstract] |  |  |
Available-for-sale securities | $ 22 |  | $ 20
Foreign currency translation adjustment | (7) | $ (6) |
Actuarial gain related to pensions and other postretirement benefits | 39 | $ 45 |
AOCI attributable to equity method investments | 11 |  | 14
Accumulated other comprehensive income | $ 65 |  | $ 73

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