Investments - Scheduled maturities for fixed income securities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Amortized cost, net
Due in one year or less	$ 2,429	$ 1,105
Due after one year through five years	26,566	21,039
Due after five years through ten years	11,356	13,808
Due after ten years	3,438	4,281
Subtotal	43,789	40,233
ABS	1,679	1,143
Amortized cost, net	45,468	41,376
Fair value
Due in one year or less	2,398	1,111
Due after one year through five years	24,992	21,291
Due after five years through ten years	9,738	14,079
Due after ten years	2,967	4,500
Subtotal	40,095	40,981
ABS	1,620	1,155
Total	$ 41,715	$ 42,136