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Loans - Loan Portfolio Composition and Aging Analysis (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 254,669	$ 255,736
Past due	8,321	9,947
Total Loans	$ 262,990	$ 265,809
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Current, percentage of total loans	96.80%	96.20%
Past due, percentage of total loans	3.20%	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	113,433	123,134
Past due	4,364	5,009
Total Loans	117,797	128,236
Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	60,417	58,436
Past due	3,616	4,627
Total Loans	64,033	63,065
Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	57,799	55,778
Past due	3,565	4,584
Total Loans	61,364	60,362
Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	2,618	2,658
Past due	51	43
Total Loans	2,669	2,703
Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	80,819	74,166
Past due	341	311
Total Loans	81,160	74,508
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	32,242	30,157
Past due	131	67
Total Loans	32,373	30,245
Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	48,577	44,009
Past due	210	244
Total Loans	48,787	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 | 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
PCI Loans | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due		10
30-59 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 3,654	$ 4,444
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	1.40%	1.60%
30-59 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,210	$ 1,474
30-59 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	2,304	2,852
30-59 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	2,275	2,828
30-59 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	29	24
30-59 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	140	118
30-59 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	53	43
30-59 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	87	75
60-89 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 1,977	$ 2,537
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	0.80%	1.00%
60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 887	$ 1,122
60-89 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,008	1,369
60-89 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	1,000	1,361
60-89 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	8	8
60-89 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	82	46
60-89 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	62	20
60-89 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	20	26
Greater than 90 days
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 2,690	$ 2,966
Financing Receivable, Recorded Investment, Aging, Percent of Total Loan [Abstract]
Past due, percentage of total loans	1.00%	1.10%
Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 2,267	$ 2,413
Greater than 90 days | Consumer Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	304	406
Greater than 90 days | Consumer Banking | Auto
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	290	395
Greater than 90 days | Consumer Banking | Retail banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	14	11
Greater than 90 days | Commercial Banking
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	119	147
Greater than 90 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	16	4
Greater than 90 days | Commercial Banking | Commercial and industrial
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	103	143
Domestic credit card: | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	105,503	113,857
Past due	4,046	4,656
Total Loans	109,549	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	1,094	1,341
Domestic credit card: | 60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	812	1,038
Domestic credit card: | Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	2,140	2,277
International card businesses: | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	7,930	9,277
Past due	318	353
Total Loans	8,248	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	116	133
International card businesses: | 60-89 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	75	84
International card businesses: | Greater than 90 days | Credit Card
Financing Receivable, Recorded Investment, Aging [Abstract]
Past due	$ 127	$ 136

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