Investments - Scheduled maturities for fixed income securities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Amortized cost, net
Due in one year or less	$ 1,099
Due after one year through five years	20,247
Due after five years through ten years	13,728
Due after ten years	5,166
Subtotal	40,240
ABS and MBS	1,104
Amortized cost, net	41,344	$ 40,034
Fair value
Due in one year or less	1,111
Due after one year through five years	20,845
Due after five years through ten years	14,278
Due after ten years	5,474
Subtotal	41,708
ABS and MBS	1,117
Total	$ 42,825	$ 42,565