Variable Interest Entities and Securitization Activities - Assets and Liabilities by Type of Activity (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity
Carrying value of variable interests—Assets	$ 1,222,233	$ 1,188,140
Carrying value of variable interests—Liabilities	1,118,158	1,081,542
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity
Carrying value of variable interests—Assets	3,173	2,912
Carrying value of variable interests—Liabilities	1,137	1,028
Variable Interest Entity, Primary Beneficiary | MABS
Variable Interest Entity
Carrying value of variable interests—Assets	1,272	1,177
Carrying value of variable interests—Liabilities	383	409
Variable Interest Entity, Primary Beneficiary | Investment vehicles
Variable Interest Entity
Carrying value of variable interests—Assets	813	717
Carrying value of variable interests—Liabilities	429	294
Variable Interest Entity, Primary Beneficiary | Operating entities
Variable Interest Entity
Carrying value of variable interests—Assets	509	508
Carrying value of variable interests—Liabilities	37	39
Variable Interest Entity, Primary Beneficiary | Other
Variable Interest Entity
Carrying value of variable interests—Assets	579	510
Carrying value of variable interests—Liabilities	$ 288	$ 286