Principles of Consolidation and Other Matters (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 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	$ 505		$ 505		$ 486
Equity method investments lag period			3 months
Net investment income	$ 1	$ 3	$ 2	$ 5
Effective tax rate (as a percent)	27.10%	24.40%	25.40%	24.60%
Share-based payments of excess tax benefit (as percent)	0.70%	1.20%	1.60%	1.30%
Unrecognized tax benefits	$ 119		$ 119		$ 124
Reasonably possible decrease in unrecognized tax benefits	$ 66		$ 66