Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Equity [Abstract]
Available-for-sale securities		$ 11	$ 9
Foreign currency translation adjustment	$ 1	6
Actuarial gain related to pensions and other postretirement benefits	$ (7)	(7)
AOCI attributable to equity method investments		19	13
Accumulated other comprehensive income		$ 29	$ 16