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Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Equity [Abstract] |  |  |
Available-for-sale securities |  | $ 20 | $ 13
Foreign currency translation adjustment | $ (5) | (11) |
Actuarial gain related to pensions and other postretirement benefits | $ 6 | 22 |
AOCI attributable to equity method investments |  | 11 | 14
Accumulated other comprehensive income |  | $ 42 | $ 28

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