Investments - Investment Funds (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 6,865	$ 6,087
Investments, excluding investments in Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 966	$ 803
Carrying Amount, Assets, Percent of Total	100.00%	100.00%
Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 5,899	$ 5,284
Carrying Amount, Assets, Percent of Total	100.00%	100.00%
Private equity | Investments, excluding investments in Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 300	$ 267
Carrying Amount, Assets, Percent of Total	31.10%	33.30%
Private equity | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 689	$ 473
Carrying Amount, Assets, Percent of Total	11.70%	8.90%
Real assets | Investments, excluding investments in Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 82	$ 81
Carrying Amount, Assets, Percent of Total	8.50%	10.10%
Real assets | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 139	$ 172
Carrying Amount, Assets, Percent of Total	2.30%	3.30%
Real estate | Investments, excluding investments in Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 462	$ 348
Carrying Amount, Assets, Percent of Total	47.80%	43.30%
Real estate | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 942	$ 828
Carrying Amount, Assets, Percent of Total	16.00%	15.70%
Natural resources | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 110	$ 113
Carrying Amount, Assets, Percent of Total	1.90%	2.10%
Differentiated investments | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 2,240	$ 1,889
Carrying Amount, Assets, Percent of Total	38.00%	35.70%
Credit funds | Investments, excluding investments in Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 122	$ 107
Carrying Amount, Assets, Percent of Total	12.60%	13.30%
Credit funds | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 398	$ 375
Carrying Amount, Assets, Percent of Total	6.70%	7.10%
Public equities | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 100	$ 110
Carrying Amount, Assets, Percent of Total	1.70%	2.10%
AmeriHome | Differentiated investments | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 583	$ 444
Carrying Amount, Assets, Percent of Total	9.90%	8.40%
Catalina Holdings (Bermuda) Ltd [Member] | Differentiated investments | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 344	$ 334
Carrying Amount, Assets, Percent of Total	5.80%	6.30%
Athora Holding Ltd. | Differentiated investments | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 689	$ 709
Carrying Amount, Assets, Percent of Total	11.70%	13.40%
Venerable | Differentiated investments | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 316	$ 123
Carrying Amount, Assets, Percent of Total	5.40%	2.30%
Apollo | Other fund | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 1,281	$ 1,324
Carrying Amount, Assets, Percent of Total	21.70%	25.10%
Individually Immaterial Counterparties | Differentiated investments | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 308	$ 279
Carrying Amount, Assets, Percent of Total	5.20%	5.30%