Investments - Maturities of AFS Securities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Amortized Cost	$ 89,044	$ 82,544
Fair Value
Total AFS fixed maturity securities	92,429	89,373
Investments, excluding investments in Related Party
Amortized Cost
Due in one year or less	985
Due after one year through five years	8,603
Due after five years through ten years	15,913
Due after ten years	32,067
CLO, ABS, CMBS and RMBS	24,622
Amortized Cost	82,190	76,100
Fair Value
Due in one year or less	1,000
Due after one year through five years	9,060
Due after five years through ten years	16,559
Due after ten years	33,968
CLO, ABS, CMBS and RMBS	24,937
Total AFS fixed maturity securities	85,524	82,853
Related Party
Amortized Cost
Due after one year through five years	18
Due after five years through ten years	195
CLO, ABS, CMBS and RMBS	6,641
Amortized Cost	6,854	6,444
Fair Value
Due after one year through five years	19
Due after five years through ten years	202
CLO, ABS, CMBS and RMBS	6,684
Total AFS fixed maturity securities	6,905	6,520
Related Party | Investments, excluding investments in Related Party
Fair Value
Total AFS fixed maturity securities	$ 6,905	$ 6,520