Investments - Schedule of Gross Realized Gains (Losses) on Sales of Fixed Income Securities (Details) - Fixed income securities - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Available for Sale Securities
Gross realized gains	$ 115	$ 136	$ 587
Gross realized losses	$ (633)	$ (1,004)	$ (158)