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Loans - Loan Portfolio Composition and Aging Analysis (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 242,710	$ 255,736
Past due	5,513	9,947
Total Loans	$ 248,223	$ 265,809	$ 249,355
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Current, percentage of total loans	97.80%	96.20%
Past due, percentage of total loans	2.20%	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	101,348	123,134
Past due	2,293	5,009
Total Loans	103,641	128,236
Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	66,006	58,436
Past due	2,682	4,627
Total Loans	68,688	63,065
Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	62,756	55,778
Past due	2,638	4,584
Total Loans	65,394	60,362
Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	3,250	2,658
Past due	44	43
Total Loans	3,294	2,703
Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	75,356	74,166
Past due	538	311
Total Loans	75,894	74,508
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	31,018	30,157
Past due	179	67
Total Loans	31,197	30,245
Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	44,338	44,009
Past due	359	244
Total Loans	44,697	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	$ 2,675	$ 4,444
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	1.10%	1.60%
30-59 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 738	$ 1,474
30-59 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,833	2,852
30-59 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,810	2,828
30-59 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	23	24
Total Loans	23
30-59 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	104	118
30-59 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	29	43
30-59 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	75	75
60-89 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,231	$ 2,537
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	0.50%	1.00%
60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 468	$ 1,122
60-89 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	675	1,369
60-89 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	669	1,361
60-89 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	6	8
Total Loans	6
60-89 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	88	46
60-89 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	4	20
60-89 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	84	26
Greater than 90 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,607	$ 2,966
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	0.60%	1.10%
Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,087	$ 2,413
Greater than 90 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	174	406
Greater than 90 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	159	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	346	147
Greater than 90 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	146	4
Greater than 90 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	200	143
Domestic credit card: | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	93,433	113,857
Past due	2,108	4,656
Total Loans	95,541	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	661	1,341
Total Loans	661
Domestic credit card: | 60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	427	1,038
Total Loans	427
Domestic credit card: | Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,020	2,277
Total Loans	1,020
International card businesses: | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	7,915	9,277
Past due	185	353
Total Loans	8,100	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	77	133
Total Loans	77
International card businesses: | 60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	41	84
Total Loans	41
International card businesses: | Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	67	$ 136
Total Loans	$ 67

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