Investments - Maturities of AFS Securities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 876
Due after one year through five years	7,209
Due after five years through ten years	11,799
Due after ten years	27,687
CLO, ABS, CMBS and RMBS	21,589
Amortized Cost	69,160	$ 67,479
Fair Value
Due in one year or less	885
Due after one year through five years	7,636
Due after five years through ten years	12,771
Due after ten years	31,177
CLO, ABS, CMBS and RMBS	21,519
Total AFS fixed maturity securities	73,988	71,374
Related Party
Amortized Cost
Due after one year through five years	34
Due after ten years	746
CLO, ABS, CMBS and RMBS	4,081
Amortized Cost	4,861	3,783
Fair Value
Due after one year through five years	36
Due after ten years	748
CLO, ABS, CMBS and RMBS	4,073
Total AFS fixed maturity securities	4,857	3,804
Investments including related party
Amortized Cost
Amortized Cost	74,021	$ 71,262
Fair Value
Total AFS fixed maturity securities	$ 78,845