Variable Interest Entities and Securitization Activities - Mortgage and Asset Backed Securitization Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity
Debt and Equity Interests	$ 1,222,233	$ 1,188,140
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
UPB	116,627	146,071
Variable Interest Entity, Not Primary Beneficiary | Residential mortgages
Variable Interest Entity
UPB	12,741	15,216
Variable Interest Entity, Not Primary Beneficiary | Commercial mortgages
Variable Interest Entity
UPB	67,450	68,503
Variable Interest Entity, Not Primary Beneficiary | U.S. agency collateralized mortgage obligations
Variable Interest Entity
UPB	31,914	57,972
Variable Interest Entity, Not Primary Beneficiary | Other consumer or commercial loans
Variable Interest Entity
UPB	4,522	4,380
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests
Variable Interest Entity
Debt and Equity Interests	13,005	18,062
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | Residential mortgages
Variable Interest Entity
Debt and Equity Interests	2,164	2,182
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | Commercial mortgages
Variable Interest Entity
Debt and Equity Interests	4,058	4,092
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | U.S. agency collateralized mortgage obligations
Variable Interest Entity
Debt and Equity Interests	4,818	9,835
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | Other consumer or commercial loans
Variable Interest Entity
Debt and Equity Interests	$ 1,965	$ 1,953