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Securitizations and Variable Interest Entities, Unconsolidated VIEs (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Variable Interest Entity [Line Items]
Loans	$ 911,807	$ 895,394	$ 861,572
Equity securities	70,755	72,886
Securitizations and Variable Interest Entities Textual [Abstract]
Trading debt securities	86,672	88,265
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member]
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE	203,353	199,695
Maximum exposure to loss	28,196	28,370
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Nonconforming mortgage loan securitizations [Member]
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE	149,765	146,482
Maximum exposure to loss	3,482	3,341
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Tax credit structures [Member]
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE	45,264	44,528
Maximum exposure to loss	17,728	17,956
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Commercial real estate loans [Member]
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE	5,482	5,489
Maximum exposure to loss	6,191	6,199
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Other [Member]
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE	2,842	3,196
Maximum exposure to loss	795	874
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Loans [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	7,649	7,916
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Loans [Member] \| Nonconforming mortgage loan securitizations [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	0	0
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Loans [Member] \| Tax credit structures [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	1,704	1,904
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Loans [Member] \| Commercial real estate loans [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	5,473	5,481
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Loans [Member] \| Other [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	472	531
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Debt securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	2,775	2,623
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Equity securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	12,261	12,384
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Nonconforming mortgage loan securitizations [Member] \| Debt securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	2,773	2,620
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Nonconforming mortgage loan securitizations [Member] \| Equity securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	0	0
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Tax credit structures [Member] \| Debt securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	0	0
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Tax credit structures [Member] \| Equity securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	12,206	12,322
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Commercial real estate loans [Member] \| Debt securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	0	0
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Commercial real estate loans [Member] \| Equity securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	0	0
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Other [Member] \| Debt securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	2	3
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Securities [Member] \| Other [Member] \| Equity securities [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	55	62
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| All other assets [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	754	751
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| All other assets [Member] \| Nonconforming mortgage loan securitizations [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	708	694
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| All other assets [Member] \| Tax credit structures [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	0	0
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| All other assets [Member] \| Commercial real estate loans [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	9	8
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| All other assets [Member] \| Other [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	37	49
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Debt, guarantees, and other commitments [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	4,757	4,696
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Debt, guarantees, and other commitments [Member] \| Nonconforming mortgage loan securitizations [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	1	27
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Debt, guarantees, and other commitments [Member] \| Tax credit structures [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	3,818	3,730
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Debt, guarantees, and other commitments [Member] \| Commercial real estate loans [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	709	710
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Debt, guarantees, and other commitments [Member] \| Other [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	229	229
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Carrying value [Member]
Variable Interest Entity [Line Items]
Loans	7,649	7,916
Debt securities	2,775	2,623
Equity securities	12,261	12,384
All other assets	754	751
Debt and other liabilities	(4,698)	(4,942)
Net assets	18,741	18,732
Securitizations and Variable Interest Entities Textual [Abstract]
Trading debt securities	336	352
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Carrying value [Member] \| Nonconforming mortgage loan securitizations [Member]
Variable Interest Entity [Line Items]
Loans	0	0
Debt securities	2,773	2,620
Equity securities	0	0
All other assets	708	694
Debt and other liabilities	(1)	0
Net assets	3,480	3,314
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Carrying value [Member] \| Tax credit structures [Member]
Variable Interest Entity [Line Items]
Loans	1,704	1,904
Debt securities	0	0
Equity securities	12,206	12,322
All other assets	0	0
Debt and other liabilities	(4,696)	(4,941)
Net assets	9,214	9,285
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Carrying value [Member] \| Commercial real estate loans [Member]
Variable Interest Entity [Line Items]
Loans	5,473	5,481
Debt securities	0	0
Equity securities	0	0
All other assets	9	8
Debt and other liabilities	0	0
Net assets	5,482	5,489
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Carrying value [Member] \| Other [Member]
Variable Interest Entity [Line Items]
Loans	472	531
Debt securities	2	3
Equity securities	55	62
All other assets	37	49
Debt and other liabilities	(1)	(1)
Net assets	$ 565	$ 644