Variable Interest Entities and Securitization Activities - Mortgage and Asset Backed Securitization Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity
Assets	$ 1,188,140	$ 1,115,862
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
UPB	146,071	184,153
Variable Interest Entity, Not Primary Beneficiary | Residential mortgages
Variable Interest Entity
UPB	15,216	17,775
Variable Interest Entity, Not Primary Beneficiary | Commercial mortgages
Variable Interest Entity
UPB	68,503	62,093
Variable Interest Entity, Not Primary Beneficiary | U.S. agency collateralized mortgage obligations
Variable Interest Entity
UPB	57,972	99,182
Variable Interest Entity, Not Primary Beneficiary | Other consumer or commercial loans
Variable Interest Entity
UPB	4,380	5,103
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests
Variable Interest Entity
Assets	18,062	26,247
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | Residential mortgages
Variable Interest Entity
Assets	2,182	3,175
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | Commercial mortgages
Variable Interest Entity
Assets	4,092	4,131
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | U.S. agency collateralized mortgage obligations
Variable Interest Entity
Assets	9,835	17,224
Variable Interest Entity, Not Primary Beneficiary | Debt and Equity Interests | Other consumer or commercial loans
Variable Interest Entity
Assets	$ 1,953	$ 1,717