Principles of Consolidation and Other Matters (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements	$ 502		$ 455
Equity method investments lag period (in months)	3 months
Net investment income	$ 5	$ 1
Effective tax rate (as a percent)	22.70%	23.90%
Share-based payments of excess tax benefit (as a percent)	2.10%	2.30%
Unrecognized tax benefits	$ 117		$ 112
Reasonably possible decrease in unrecognized tax benefits	$ 70