Investments - Scheduled maturities for fixed income securities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Amortized cost, net
Due in one year or less	$ 3,288
Due after one year through five years	25,165
Due after five years through ten years	21,960
Due after ten years	10,561
Subtotal	60,974
ABS and MBS	1,293
Amortized cost	62,267	$ 56,293
Fair value
Due in one year or less	3,333
Due after one year through five years	26,373
Due after five years through ten years	23,717
Due after ten years	11,830
Subtotal	65,253
ABS and MBS	1,298
Total fixed income securities	$ 66,551	$ 59,044