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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Current	$ 270,655	$ 245,060
Total	$ 277,340	$ 251,624
Current, percentage of total loans	97.59%	97.39%
Percentage of total loans	100.00%	100.00%
Unamortized premiums and discounts, deferred fees and costs	$ 1,400	$ 1,100
Accrued interest receivable	1,200	1,200
Credit Card
Financing Receivable, Past Due [Line Items]
Current	112,148	104,334
Total	114,772	106,956
Consumer Banking
Financing Receivable, Past Due [Line Items]
Current	74,028	65,445
Total	77,646	68,888
Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Current	72,221	62,381
Total	75,779	65,762
Consumer Banking | Retail banking
Financing Receivable, Past Due [Line Items]
Current	1,807	3,064
Total	1,867	3,126
Commercial Banking
Financing Receivable, Past Due [Line Items]
Current	84,479	75,281
Total	84,922	75,780
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Current	35,100	30,340
Total	35,262	30,681
Commercial Banking | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Current	49,379	44,941
Total	$ 49,660	$ 45,099
30-59 days
Financing Receivable, Past Due [Line Items]
Past due, percentage of total loans	1.26%	1.32%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 3,501	$ 3,330
30-59 days | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	850	845
30-59 days | Consumer Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	2,420	2,280
30-59 days | Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	2,385	2,252
30-59 days | Consumer Banking | Retail banking
Financing Receivable, Past Due [Line Items]
Total	35	28
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	35	28
30-59 days | Commercial Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	231	205
30-59 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	92	136
30-59 days | Commercial Banking | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 139	$ 69
60-89 days
Financing Receivable, Past Due [Line Items]
Past due, percentage of total loans	0.60%	0.59%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 1,656	$ 1,485
60-89 days | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	578	522
60-89 days | Consumer Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	940	926
60-89 days | Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	933	907
60-89 days | Consumer Banking | Retail banking
Financing Receivable, Past Due [Line Items]
Total	7	19
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	7	19
60-89 days | Commercial Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	138	37
60-89 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	35	22
60-89 days | Commercial Banking | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 103	$ 15
Greater than 90 days
Financing Receivable, Past Due [Line Items]
Past due, percentage of total loans	0.55%	0.70%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 1,528	$ 1,749
Greater than 90 days | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	1,196	1,255
Greater than 90 days | Consumer Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	258	237
Greater than 90 days | Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	240	222
Greater than 90 days | Consumer Banking | Retail banking
Financing Receivable, Past Due [Line Items]
Total	18	15
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	18	15
Greater than 90 days | Commercial Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	74	257
Greater than 90 days | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	35	183
Greater than 90 days | Commercial Banking | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 39	$ 74
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Past due total, percentage of total loans	2.41%	2.61%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 6,685	$ 6,564
Financial Asset, Past Due | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	2,624	2,622
Financial Asset, Past Due | Consumer Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	3,618	3,443
Financial Asset, Past Due | Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	3,558	3,381
Financial Asset, Past Due | Consumer Banking | Retail banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	60	62
Financial Asset, Past Due | Commercial Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	443	499
Financial Asset, Past Due | Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	162	341
Financial Asset, Past Due | Commercial Banking | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	281	158
Domestic credit card: | Credit Card
Financing Receivable, Past Due [Line Items]
Current	106,312	96,116
Total	108,723	98,504
Domestic credit card: | 30-59 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	773	755
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	773	755
Domestic credit card: | 60-89 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	528	464
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	528	464
Domestic credit card: | Greater than 90 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	1,110	1,169
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	1,110	1,169
Domestic credit card: | Financial Asset, Past Due | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	2,411	2,388
International card businesses: | Credit Card
Financing Receivable, Past Due [Line Items]
Current	5,836	8,218
Total	6,049	8,452
International card businesses: | 30-59 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	77	90
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	77	90
International card businesses: | 60-89 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	50	58
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	50	58
International card businesses: | Greater than 90 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	86	86
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	86	86
International card businesses: | Financial Asset, Past Due | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 213	$ 234

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