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Loans - Loan Portfolio Composition and Aging Analysis (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 245,722	$ 255,736
Past due	5,790	9,947
Total Loans	$ 251,512	$ 265,809
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Current, percentage of total loans	97.70%	96.20%
Past due, percentage of total loans	2.30%	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	104,355	123,134
Past due	2,955	5,009
Total Loans	107,310	128,236
Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	64,389	58,436
Past due	2,323	4,627
Total Loans	66,712	63,065
Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	61,043	55,778
Past due	2,276	4,584
Total Loans	63,319	60,362
Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	3,346	2,658
Past due	47	43
Total Loans	3,393	2,703
Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	76,978	74,166
Past due	512	311
Total Loans	77,490	74,508
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	30,667	30,157
Past due	286	67
Total Loans	30,953	30,245
Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	46,311	44,009
Past due	226	244
Total Loans	46,537	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	$ 2,532	$ 4,444
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	1.00%	1.60%
30-59 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 744	$ 1,474
30-59 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,537	2,852
30-59 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,517	2,828
30-59 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	20	24
Total Loans	20
30-59 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	251	118
30-59 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	137	43
30-59 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	114	75
60-89 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,342	$ 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	$ 608	$ 1,122
60-89 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	593	1,369
60-89 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	582	1,361
60-89 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	11	8
Total Loans	11
60-89 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	141	46
60-89 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	118	20
60-89 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	23	26
Greater than 90 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,916	$ 2,966
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	0.80%	1.10%
Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,603	$ 2,413
Greater than 90 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	193	406
Greater than 90 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	177	395
Greater than 90 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	16	11
Total Loans	16
Greater than 90 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	120	147
Greater than 90 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	31	4
Greater than 90 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	89	143
Domestic credit card: | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	96,666	113,857
Past due	2,724	4,656
Total Loans	99,390	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	668	1,341
Total Loans	668
Domestic credit card: | 60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	554	1,038
Total Loans	554
Domestic credit card: | Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,502	2,277
Total Loans	1,502
International card businesses: | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	7,689	9,277
Past due	231	353
Total Loans	7,920	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	76	133
Total Loans	76
International card businesses: | 60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	54	84
Total Loans	54
International card businesses: | Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	101	$ 136
Total Loans	$ 101

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