Variable Interest Entities - Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity
Assets	$ 211,116	$ 204,680
Liabilities	188,906	181,569
Variable Interest Entity, Not Primary Beneficiary | CDC investments
Variable Interest Entity
Assets	1,705	1,546
Liabilities	580	478
Maximum Exposure	1,705	1,546
Variable Interest Entity, Not Primary Beneficiary | Private equity investments
Variable Interest Entity
Assets	133	117
Liabilities	0	0
Maximum Exposure	257	200
Variable Interest Entity, Not Primary Beneficiary | Loans provided to VIEs
Variable Interest Entity
Assets	3,386	2,420
Liabilities	0	0
Maximum Exposure	4,873	3,649
Variable Interest Entity, Not Primary Beneficiary | Lease pool entities
Variable Interest Entity
Assets	68	73
Liabilities	0	0
Maximum Exposure	$ 68	$ 73