Variable Interest Entities and Securitization Activities - Assets and Liabilities by Type of Activity (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity
Carrying value of variable interests—Assets	$ 1,188,140	$ 1,115,862
Carrying value of variable interests—Liabilities	1,081,542	1,012,713
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity
Carrying value of variable interests—Assets	2,912	2,118
Carrying value of variable interests—Liabilities	1,028	414
Variable Interest Entity, Primary Beneficiary | MABS
Variable Interest Entity
Carrying value of variable interests—Assets	1,177	590
Carrying value of variable interests—Liabilities	409	17
Variable Interest Entity, Primary Beneficiary | Investment Vehicles
Variable Interest Entity
Carrying value of variable interests—Assets	717	776
Carrying value of variable interests—Liabilities	294	355
Variable Interest Entity, Primary Beneficiary | Operating entities
Variable Interest Entity
Carrying value of variable interests—Assets	508	504
Carrying value of variable interests—Liabilities	39	39
Variable Interest Entity, Primary Beneficiary | Other
Variable Interest Entity
Carrying value of variable interests—Assets	510	248
Carrying value of variable interests—Liabilities	$ 286	$ 3