Investments - Investment Funds (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 682	$ 750
Carrying Amount, Assets, Percent of Total	100.00%	100.00%
Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 5,278	$ 3,550
Carrying Amount, Assets, Percent of Total	100.00%	100.00%
Private equity
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 232	$ 236
Carrying Amount, Assets, Percent of Total	34.00%	31.50%
Private equity | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 255	$ 105
Carrying Amount, Assets, Percent of Total	4.80%	3.00%
Real assets
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 61	$ 83
Carrying Amount, Assets, Percent of Total	8.90%	11.10%
Real assets | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 233	$ 182
Carrying Amount, Assets, Percent of Total	4.40%	5.10%
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 274	$ 277
Carrying Amount, Assets, Percent of Total	40.20%	36.90%
Real estate | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 709	$ 853
Carrying Amount, Assets, Percent of Total	13.40%	24.00%
Natural resources
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 0	$ 1
Carrying Amount, Assets, Percent of Total	0.00%	0.10%
Natural resources | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 95	$ 163
Carrying Amount, Assets, Percent of Total	1.80%	4.60%
Other fund | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 246	$ 222
Carrying Amount, Assets, Percent of Total	4.70%	6.30%
Differentiated investments | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 2,267	$ 1,758
Carrying Amount, Assets, Percent of Total	43.00%	49.50%
Credit funds
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 115	$ 153
Carrying Amount, Assets, Percent of Total	16.90%	20.40%
Credit funds | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 363	$ 370
Carrying Amount, Assets, Percent of Total	6.90%	10.40%
Public equities | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 43	$ 119
Carrying Amount, Assets, Percent of Total	0.80%	3.40%
Investments including related party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 5,960	$ 4,300
MidCap | Credit funds | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 517	$ 547
Carrying Amount, Assets, Percent of Total	9.80%	15.40%
AmeriHome | Private equity | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 594	$ 487
Carrying Amount, Assets, Percent of Total	11.30%	13.70%
Catalina Holdings (Bermuda) Ltd [Member] | Private equity | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 295	$ 271
Carrying Amount, Assets, Percent of Total	5.60%	7.60%
Athora Holding Ltd. | Private equity | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 497	$ 132
Carrying Amount, Assets, Percent of Total	9.40%	3.70%
Venerable | Private equity | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 118	$ 99
Carrying Amount, Assets, Percent of Total	2.20%	2.80%
Apollo | Other fund | Related Party
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 1,313	$ 0
Carrying Amount, Assets, Percent of Total	24.90%	0.00%