Investments - Scheduled maturities for fixed income securities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Amortized cost, net
Due in one year or less	$ 1,579	$ 1,105
Due after one year through five years	25,992	21,039
Due after five years through ten years	11,697	13,808
Due after ten years	3,143	4,281
Subtotal	42,411	40,233
ABS	1,616	1,143
Amortized cost, net	44,027	41,376
Fair value
Due in one year or less	1,569	1,111
Due after one year through five years	24,961	21,291
Due after five years through ten years	10,352	14,079
Due after ten years	2,838	4,500
Subtotal	39,720	40,981
ABS	1,562	1,155
Total	$ 41,282	$ 42,136