Securitizations and Variable Interest Entities, Transfers with Continuing Involvement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Excluding resecuritization [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Cash flows from other interests held	$ 136	$ 75
Excluding resecuritization [Member] | Fair value, inputs, level 2 [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Securities recognized, trading	6,700	6,800
Excluding resecuritization [Member] | Residential mortgages [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Assets sold	26,174	40,586
Proceeds from transfer	26,226	40,691
Net gains (losses) on sale	52	105
Excluding resecuritization [Member] | Residential mortgages [Member] | Fair value, inputs, level 3 [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Servicing rights recognized	327	407
Excluding resecuritization [Member] | Residential mortgages [Member] | Fair value, inputs, level 2 [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Securities recognized	1,587	10,223
Excluding resecuritization [Member] | Residential mortgages [Member] | Collateralized financing receivable [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Loans recognized	0	926
Excluding resecuritization [Member] | Commercial mortgages [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Assets sold	4,033	3,191
Proceeds from transfer	4,097	3,282
Net gains (losses) on sale	64	91
Excluding resecuritization [Member] | Commercial mortgages [Member] | Fair value, inputs, level 3 [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Servicing rights recognized	29	47
Excluding resecuritization [Member] | Commercial mortgages [Member] | Fair value, inputs, level 2 [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Securities recognized	104	29
Excluding resecuritization [Member] | Commercial mortgages [Member] | Collateralized financing receivable [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Loans recognized	0	0
Government insured or guaranteed [Member] | Excluding resecuritization [Member] | Residential mortgages [Member]
Quantitative Information, Transferor's Continuing Involvement [Line Items]
Net gains (losses) on sale	0	0
VIEs that we do not consolidate [Member] | Excluding resecuritization [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Maximum exposure to loss	28,196		$ 28,370
VIEs that we do not consolidate [Member] | Excluding resecuritization [Member] | Debt, guarantees, and other commitments [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Maximum exposure to loss	4,757		4,696
VIEs that we do not consolidate [Member] | Conforming mortgage loan securitization [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Repurchases of assets/loss reimbursements	933	$ 1,900
Carrying value of delinquent loans eligible for repurchase	35		107
Principal amount that would be payable to securitization vehicles	35		107
VIEs that we do not consolidate [Member] | Conforming mortgage loan securitization [Member] | Debt and other liabilities [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Liability for mortgage repurchase reserves amount, fair value	164		173
VIEs that we do not consolidate [Member] | Conforming mortgage loan securitization [Member] | Debt, guarantees, and other commitments [Member]
Securitizations and Variable Interest Entities Textual [Abstract]
Maximum exposure to loss	$ 13,300		$ 13,300