Commitments and Contingencies - Pledged Assets and Funds in Trust (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
AFS securities	$ 17,054	$ 15,366
Debt Securities, Trading, Restricted	69	55
Equity securities	71	38
Investment funds	84	103
Derivative assets pledged as collateral	80	65
Other investments	215	170
Restricted cash	1,148	628
Total restricted assets	26,815	25,394
Other Commitments [Line Items]
Short-term investments	131	120
Asset Pledged as Collateral
Commitments and Contingencies Disclosure [Abstract]
Mortgage loans, net of allowances	7,963	8,849
Other Commitments [Line Items]
Mortgage loans, net of allowances	$ 7,963	$ 8,849