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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 245,060	$ 255,736
Past due	6,564	9,947
Total Loans	$ 251,624	$ 265,809	$ 245,899
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Current, percentage of total loans	97.40%	96.20%
Past due, percentage of total loans	2.60%	3.70%
Percentage of total loans	100.00%	100.00%
Unamortized premiums and discounts, deferred fees and costs	$ 1,100	$ 1,100
Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	104,334	123,134
Past due	2,622	5,009
Total Loans	106,956	128,236
Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	65,445	58,436
Past due	3,443	4,627
Total Loans	68,888	63,065
Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	62,381	55,778
Past due	3,381	4,584
Total Loans	65,762	60,362
Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	3,064	2,658
Past due	62	43
Total Loans	3,126	2,703
Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	75,281	74,166
Past due	499	311
Total Loans	75,780	74,508
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	30,340	30,157
Past due	341	67
Total Loans	30,681	30,245
Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	44,941	44,009
Past due	158	244
Total Loans	45,099	44,263
PCI Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		$ 126
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Percentage of total loans		0.10%
PCI Loans | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		$ 93
PCI Loans | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		2
PCI Loans | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		0
PCI Loans | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		2
PCI Loans | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Loans		31
PCI Loans | Commercial Banking | Total commercial lending
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		31
PCI Loans | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		21
Total Loans		21
PCI Loans | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		10
Total Loans		10
30-59 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 3,330	$ 4,444
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	1.30%	1.60%
30-59 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 845	$ 1,474
30-59 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	2,280	2,852
30-59 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	2,252	2,828
30-59 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	28	24
Total Loans	28
30-59 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	205	118
30-59 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	136	43
30-59 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	69	75
60-89 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,485	$ 2,537
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	0.60%	1.00%
60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 522	$ 1,122
60-89 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	926	1,369
60-89 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	907	1,361
60-89 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	19	8
Total Loans	19
60-89 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	37	46
60-89 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	22	20
60-89 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	15	26
Greater than 90 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,749	$ 2,966
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	0.70%	1.10%
Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,255	$ 2,413
Greater than 90 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	237	406
Greater than 90 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	222	395
Greater than 90 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	15	11
Total Loans	15
Greater than 90 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	257	147
Greater than 90 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	183	4
Greater than 90 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	74	143
Domestic credit card: | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	96,116	113,857
Past due	2,388	4,656
Total Loans	98,504	118,606
Domestic credit card: | PCI Loans | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		93
Domestic credit card: | 30-59 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	755	1,341
Total Loans	755
Domestic credit card: | 60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	464	1,038
Total Loans	464
Domestic credit card: | Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,169	2,277
Total Loans	1,169
International card businesses: | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	8,218	9,277
Past due	234	353
Total Loans	8,452	9,630
International card businesses: | PCI Loans | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		0
International card businesses: | 30-59 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	90	133
Total Loans	90
International card businesses: | 60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	58	84
Total Loans	58
International card businesses: | Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	86	$ 136
Total Loans	$ 86

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