Investments - Scheduled maturities for fixed Income securities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Amortized cost, net
Due in one year or less	$ 1,105
Due after one year through five years	21,039
Due after five years through ten years	13,808
Due after ten years	4,281
Subtotal	40,233
ABS	1,143
Amortized cost, net	41,376	$ 40,034
Fair value
Due in one year or less	1,111
Due after one year through five years	21,291
Due after five years through ten years	14,079
Due after ten years	4,500
Subtotal	40,981
ABS	1,155
Fair value	$ 42,136	$ 42,565