Fair Values - Fund Interests Measured Based on Net Asset Value (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Measured Based on Net Asset Value
Carrying Value	$ 5,309	$ 4,747
Commitment	782	865
Private equity
Measured Based on Net Asset Value
Carrying Value	2,795	2,492
Commitment	538	615
Real estate
Measured Based on Net Asset Value
Carrying Value	2,316	2,064
Commitment	242	248
Hedge
Measured Based on Net Asset Value
Carrying Value	198	191
Commitment	$ 2	$ 2