Off-balance Sheet Lending-related Financial Instruments, Guarantees, and Other Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	$ 1,326,782	$ 1,262,313
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	938,165
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	144,353
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	213,146
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	31,118
Off-balance sheet lending-related financial commitments, Carrying value	2,817	2,624
Total consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	854,802	775,868
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	837,082
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	3,501
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,542
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	7,677
Off-balance sheet lending-related financial commitments, Carrying value	75	102
Total consumer, excluding credit card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	33,518	45,334
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	15,798
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	3,501
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,542
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	7,677
Off-balance sheet lending-related financial commitments, Carrying value	75	102
Residential real estate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	21,287	32,996
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	5,156
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	3,500
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,542
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	6,089
Off-balance sheet lending-related financial commitments, Carrying value	75	100
Auto and other
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	12,231	12,338
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	10,642
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	1
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	1,588
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	821,284	730,534
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	821,284
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	471,980	486,445
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	101,083
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	140,852
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	206,604
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	23,441
Off-balance sheet lending-related financial commitments, Carrying value	2,742	2,522
Other unfunded commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	440,407	453,467
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	83,832
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	132,237
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	201,921
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	22,417
Off-balance sheet lending-related financial commitments, Carrying value	2,328	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	71	44
Standby letters of credit and other financial guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	27,439	28,530
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	13,559
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	8,272
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	4,585
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	1,023
Off-balance sheet lending-related financial commitments, Carrying value	408	476
Other guarantees and commitments, Carrying value	326	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	4,134	4,448
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	3,692
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	343
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	98
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	1
Off-balance sheet lending-related financial commitments, Carrying value	6	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	512	451
Securities lending indemnification agreements and guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	283,386	337,770
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	283,386
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	298,500	357,400
Derivatives qualifying as guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	59,180	55,730
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	5,082
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	466
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	12,632
Other guarantees and commitments, Contractual amount, Expiring after 5 years	41,000
Other guarantees and commitments, Carrying value	649	475
Unsettled resale and securities borrowed agreements
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	116,975	103,681
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	116,260
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	715
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	(2)	1
Unsettled repurchase and securities loaned agreements
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	66,407	74,263
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	65,873
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	534
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	(7)	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	76	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	820	827
Loan sale and securitization-related indemnifications, Loans sold with recourse, Carrying value	28	19
Exchange & clearing house guarantees and commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	191,068	182,701
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	191,068
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	8,634	10,490
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	4,856
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	723
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	209
Other guarantees and commitments, Contractual amount, Expiring after 5 years	2,846
Other guarantees and commitments, Carrying value	$ 53	$ 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