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Loans - Loan Portfolio Composition and Aging Analysis (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 255,736	$ 236,310
Past due	9,947	9,454
Loans held for investment	$ 265,809	$ 245,899	$ 254,473
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Current, percentage of total loans	96.20%	96.10%
Past due, percentage of total loans	3.70%	3.80%
Percentage of total loans	100.00%	100.00%
Unamortized premiums and discounts, deferred fees and costs	$ 1,100	$ 818
Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	123,134	111,692
Past due	5,009	4,668
Loans held for investment	128,236	116,361
Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	58,436	54,841
Past due	4,627	4,360
Loans held for investment	63,065	59,205
Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	55,778	52,032
Past due	4,584	4,309
Loans held for investment	60,362	56,341
Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	2,658	2,809
Past due	43	51
Loans held for investment	2,703	2,864
Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	74,166	69,777
Past due	311	426
Loans held for investment	74,508	70,333
Commercial Banking | Total commercial lending
Financing Receivable, Recorded Investment, Aging [Abstract]
Current		69,441
Past due		419
Loans held for investment		69,990
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	30,157	28,737
Past due	67	140
Loans held for investment	30,245	28,899
Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	44,009	40,704
Past due	244	279
Loans held for investment	44,263	41,091
Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Current		336
Past due		7
Loans held for investment		343
PCI Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	$ 126	$ 135
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Percentage of total loans	0.10%	0.10%
PCI Loans | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	$ 93	$ 1
PCI Loans | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	2	4
PCI Loans | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	0	0
PCI Loans | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	2	4
PCI Loans | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	31	130
PCI Loans | Commercial Banking | Total commercial lending
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment		130
PCI Loans | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	21	22
PCI Loans | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	10	108
PCI Loans | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment		0
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 4,444	$ 4,282
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	1.60%	1.70%
Financing Receivables, 30 to 59 Days Past Due | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,474	$ 1,397
Financing Receivables, 30 to 59 Days Past Due | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	2,852	2,647
Financing Receivables, 30 to 59 Days Past Due | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	2,828	2,624
Financing Receivables, 30 to 59 Days Past Due | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	24	23
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	118	238
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Total commercial lending
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		236
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	43	101
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	75	135
Financing Receivables, 30 to 59 Days Past Due | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		2
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 2,537	$ 2,430
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	1.00%	1.00%
Financing Receivables, 60 to 89 Days Past Due | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,122	$ 1,032
Financing Receivables, 60 to 89 Days Past Due | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,369	1,334
Financing Receivables, 60 to 89 Days Past Due | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,361	1,326
Financing Receivables, 60 to 89 Days Past Due | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	8	8
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	46	64
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Total commercial lending
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		63
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	20	20
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	26	43
Financing Receivables, 60 to 89 Days Past Due | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		1
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 2,966	$ 2,742
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	1.10%	1.10%
Financing Receivables, Equal to Greater than 90 Days Past Due | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 2,413	$ 2,239
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	406	379
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	395	359
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	11	20
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	147	124
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Total commercial lending
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		120
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	4	19
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	143	101
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Banking | Small-ticket commercial real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		4
Domestic credit card | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	113,857	103,014
Past due	4,656	4,335
Loans held for investment	118,606	107,350
Domestic credit card | PCI Loans | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	93	1
Domestic credit card | Financing Receivables, 30 to 59 Days Past Due | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,341	1,270
Domestic credit card | Financing Receivables, 60 to 89 Days Past Due | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,038	954
Domestic credit card | Financing Receivables, Equal to Greater than 90 Days Past Due | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	2,277	2,111
International card business | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	9,277	8,678
Past due	353	333
Loans held for investment	9,630	9,011
International card business | PCI Loans | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans held for investment	0	0
International card business | Financing Receivables, 30 to 59 Days Past Due | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	133	127
International card business | Financing Receivables, 60 to 89 Days Past Due | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	84	78
International card business | Financing Receivables, Equal to Greater than 90 Days Past Due | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 136	$ 128

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