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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