Principles of Consolidation And Other Matters (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements	$ 480		$ 486
Equity method investments lag period	3 months
Net investment income	$ 1	$ 2
Effective tax rate (as a percent)	23.90%	24.70%
Excess tax benefit related to share-based payments, percent	2.30%	1.30%
Unrecognized tax benefits	$ 127		$ 124
Reasonably possible decrease in unrecognized tax benefits	$ 66