Principles of Consolidation And Other Matters (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements	$ 464		$ 464		$ 348
Equity method investments lag period			3 months
Gain on investment income, net	$ 3	$ 2	$ 5	$ 28
Effective tax rate (as a percent)	24.40%	25.50%	24.60%	24.60%
Share-based payments of excess tax benefit (as percent)	1.20%	0.80%	1.30%	1.30%
Unrecognized tax benefits	$ 107		$ 107		$ 97
Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Reasonably possible decrease in unrecognized tax benefits	$ 52		$ 52