Investments - Scheduled maturities for fixed income securities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Amortized cost, net
Due in one year or less	$ 3,300
Due after one year through five years	24,971
Due after five years through ten years	21,627
Due after ten years	9,705
Subtotal	59,603
ABS and MBS	931
Amortized cost	60,534	$ 56,293
Fair value
Due in one year or less	3,343
Due after one year through five years	26,036
Due after five years through ten years	23,204
Due after ten years	10,922
Subtotal	63,505
ABS and MBS	943
Total fixed income securities	$ 64,448	$ 59,044