Investments - Maturities of AFS Securities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 1,203
Due after one year through five years	9,089
Due after five years through ten years	11,247
Due after ten years	26,900
CLO, ABS, CMBS and RMBS	22,776
Amortized Cost	71,215	$ 67,479
Fair Value
Due in one year or less	1,210
Due after one year through five years	9,467
Due after five years through ten years	11,958
Due after ten years	29,918
CLO, ABS, CMBS and RMBS	22,182
Total AFS fixed maturity securities	74,735	71,374
Related Party
Amortized Cost
Due after five years through ten years	18
CLO, ABS, CMBS and RMBS	4,155
Amortized Cost	4,173	3,783
Fair Value
Due after five years through ten years	20
CLO, ABS, CMBS and RMBS	4,050
Total AFS fixed maturity securities	4,070	3,804
Investments including related party
Amortized Cost
Amortized Cost	75,388	$ 71,262
Fair Value
Total AFS fixed maturity securities	$ 78,805