Off-balance Sheet Lending-related Financial Instruments, Guarantees, and Other Commitments (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	$ 1,302,005	$ 1,262,313
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	926,819
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	152,406
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	189,753
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	33,027
Off-balance sheet lending-related financial commitments, Carrying value	2,868	2,624
Total Consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	814,505	775,868
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	796,639
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	2,737
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,475
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	8,654
Off-balance sheet lending-related financial commitments, Carrying value	125	102
Total consumer, excluding credit card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	40,484	45,334
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	22,618
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	2,737
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,475
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	8,654
Off-balance sheet lending-related financial commitments, Carrying value	125	102
Residential real estate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	28,163	32,996
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	11,475
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	2,737
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,475
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	7,476
Off-balance sheet lending-related financial commitments, Carrying value	125	100
Auto and other
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	12,321	12,338
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	11,143
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	0
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	0
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	1,178
Off-balance sheet lending-related financial commitments, Carrying value	0	2
Credit card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	774,021	730,534
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	774,021
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	0
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	0
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	0
Off-balance sheet lending-related financial commitments, Carrying value	0	0
Total wholesale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	487,500	486,445
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	130,180
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	149,669
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	183,278
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	24,373
Off-balance sheet lending-related financial commitments, Carrying value	2,743	2,522
Other unfunded commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	455,443	453,467
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	112,164
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	141,382
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	178,584
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	23,313
Off-balance sheet lending-related financial commitments, Carrying value	2,307	2,037
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information [Abstract]
Risk participations for other unfunded commitments to extend credit	44	44
Standby letters of credit and other financial guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	28,051	28,530
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	14,512
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	7,863
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	4,616
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	1,060
Off-balance sheet lending-related financial commitments, Carrying value	417	476
Other guarantees and commitments, Carrying value	320	353
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information [Abstract]
Risk participations for standby letters of credit and other financial guarantees	8,200	7,900
Other letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	4,006	4,448
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	3,504
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	424
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	78
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	0
Off-balance sheet lending-related financial commitments, Carrying value	19	9
Other guarantees and commitments, Carrying value	0	0
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information [Abstract]
Risk participations for other letters of credit	899	451
Securities lending indemnification agreements and guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	337,049	337,770
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	337,049
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	0
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	0
Other guarantees and commitments, Contractual amount, Expiring after 5 years	0
Other guarantees and commitments, Carrying value	0	0
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information [Abstract]
Indemnification agreement securities lending guarantees collateral held in support of	355,200	357,400
Derivatives qualifying as guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	54,183	55,730
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	3,372
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	146
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	12,791
Other guarantees and commitments, Contractual amount, Expiring after 5 years	37,874
Other guarantees and commitments, Carrying value	842	475
Unsettled resale and securities borrowed agreements
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	195,330	103,681
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	193,602
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	1,728
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	0
Other guarantees and commitments, Contractual amount, Expiring after 5 years	0
Other guarantees and commitments, Carrying value	(11)	1
Unsettled repurchase and securities loaned agreements
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	99,428	74,263
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	98,905
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	523
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	0
Other guarantees and commitments, Contractual amount, Expiring after 5 years	0
Other guarantees and commitments, Carrying value	(4)	0
Mortgage repurchase liability
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan sale and securitization-related indemnifications, Mortgage repurchase liability, Carrying value	54	61
Loans sold with recourse
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan sale and securitization-related indemnifications, Loans sold with recourse, Contractual amount	788	827
Loan sale and securitization-related indemnifications, Loans sold with recourse, Carrying value	12	19
Exchange & clearing house guarantees and commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	127,727	182,701
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	127,727
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	0
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	0
Other guarantees and commitments, Contractual amount, Expiring after 5 years	0
Other guarantees and commitments, Carrying value	0	0
Other guarantees and commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	11,323	10,490
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	7,916
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	915
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	288
Other guarantees and commitments, Contractual amount, Expiring after 5 years	2,204
Other guarantees and commitments, Carrying value	$ 63	$ 69
Days Past Due, 60 or More | Credit card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Line of credit close criteria, period past due	60 days