Off-balance Sheet Lending-related Financial Instruments, Guarantees, and Other Commitments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	$ 1,301,618	$ 1,262,313
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	925,703
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	166,515
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	174,694
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	34,706
Off-balance sheet lending-related financial commitments, Carrying value	2,760	2,624
Total Consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	804,386	775,868
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	786,221
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	2,404
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,242
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	9,519
Off-balance sheet lending-related financial commitments, Carrying value	153	102
Total consumer, excluding credit card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	47,103	45,334
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	28,938
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	2,404
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,242
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	9,519
Off-balance sheet lending-related financial commitments, Carrying value	153	102
Residential real estate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	34,499	32,996
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	17,388
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	2,404
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,242
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	8,465
Off-balance sheet lending-related financial commitments, Carrying value	153	100
Auto and other
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	12,604	12,338
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	11,550
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	1,054
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	757,283	730,534
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	757,283
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	497,232	486,445
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	139,482
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	164,111
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	168,452
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	25,187
Off-balance sheet lending-related financial commitments, Carrying value	2,607	2,522
Other unfunded commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	462,811	453,467
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	119,003
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	155,375
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	164,356
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	24,077
Off-balance sheet lending-related financial commitments, Carrying value	2,120	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	51	44
Standby letters of credit and other financial guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	27,909	28,530
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	14,536
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	8,245
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	4,018
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	1,110
Off-balance sheet lending-related financial commitments, Carrying value	476	476
Other guarantees and commitments, Carrying value	340	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	7,800	7,900
Other letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	6,512	4,448
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	5,943
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	491
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	11	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	660	451
Securities lending indemnification agreements and guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	365,249	337,770
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	365,249
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	387,600	357,400
Derivatives qualifying as guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	57,574	55,730
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	3,012
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	292
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	12,491
Other guarantees and commitments, Contractual amount, Expiring after 5 years	41,779
Other guarantees and commitments, Carrying value	486	475
Unsettled resale and securities borrowed agreements
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	218,197	103,681
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	216,026
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	2,121
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	50
Other guarantees and commitments, Contractual amount, Expiring after 5 years	0
Other guarantees and commitments, Carrying value	(45)	1
Unsettled repurchase and securities loaned agreements
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	135,289	74,263
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	134,400
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	889
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)	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	57	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	846	827
Loan sale and securitization-related indemnifications, Loans sold with recourse, Carrying value	18	19
Exchange & clearing house guarantees and commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	141,956	182,701
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	141,956
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	14,213	10,490
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	11,080
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	949
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	282
Other guarantees and commitments, Contractual amount, Expiring after 5 years	1,902
Other guarantees and commitments, Carrying value	$ 65	$ 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