Investments - Gross realized gains (losses) on sales of fixed income securities (Details) - Fixed income securities - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Available for Sale Securities
Gross realized gains	$ 28	$ 27	$ 74	$ 93
Gross realized losses	$ (153)	$ (349)	$ (326)	$ (567)