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Loans - Loan Portfolio Composition and Aging Analysis (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Current	$ 295,506	$ 270,655
Total	$ 303,943	$ 277,340
Current, percentage of total loans	97.22%	97.59%
Percentage of total loans	100.00%	100.00%
Unamortized premiums and discounts, deferred fees and costs	$ 1,400	$ 1,400
Credit Card
Financing Receivable, Past Due [Line Items]
Current	123,085	112,148
Total	126,913	114,772
Consumer Banking
Financing Receivable, Past Due [Line Items]
Current	76,909	74,028
Total	81,199	77,646
Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Current	75,329	72,221
Total	79,580	75,779
Consumer Banking | Retail banking
Financing Receivable, Past Due [Line Items]
Current	1,580	1,807
Total	1,619	1,867
Commercial Banking
Financing Receivable, Past Due [Line Items]
Current	95,512	84,479
Total	95,831	84,922
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Current	38,056	35,100
Total	38,225	35,262
Commercial Banking | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Current	57,456	49,379
Total	$ 57,606	$ 49,660
30-59 days
Financing Receivable, Past Due [Line Items]
Past due, percentage of total loans	1.39%	1.26%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 4,230	$ 3,501
30-59 days | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	1,258	850
30-59 days | Consumer Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	2,769	2,420
30-59 days | Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	2,754	2,385
30-59 days | Consumer Banking | Retail banking
Financing Receivable, Past Due [Line Items]
Total	15	35
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	15	35
30-59 days | Commercial Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	203	231
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	134	92
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	$ 69	$ 139
60-89 days
Financing Receivable, Past Due [Line Items]
Past due, percentage of total loans	0.69%	0.60%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 2,091	$ 1,656
60-89 days | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	870	578
60-89 days | Consumer Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	1,207	940
60-89 days | Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	1,202	933
60-89 days | Consumer Banking | Retail banking
Financing Receivable, Past Due [Line Items]
Total	5	7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	5	7
60-89 days | Commercial Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	14	138
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	1	35
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	$ 13	$ 103
Greater than 90 days
Financing Receivable, Past Due [Line Items]
Past due, percentage of total loans	0.70%	0.55%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 2,116	$ 1,528
Greater than 90 days | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	1,700	1,196
Greater than 90 days | Consumer Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	314	258
Greater than 90 days | Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	295	240
Greater than 90 days | Consumer Banking | Retail banking
Financing Receivable, Past Due [Line Items]
Total	19	18
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	19	18
Greater than 90 days | Commercial Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	102	74
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	34	35
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	$ 68	$ 39
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Past due total, percentage of total loans	2.78%	2.41%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	$ 8,437	$ 6,685
Financial Asset, Past Due | Credit Card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	3,828	2,624
Financial Asset, Past Due | Consumer Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	4,290	3,618
Financial Asset, Past Due | Consumer Banking | Auto
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	4,251	3,558
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	39	60
Financial Asset, Past Due | Commercial Banking
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	319	443
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	169	162
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	150	281
Domestic credit card: | Credit Card
Financing Receivable, Past Due [Line Items]
Current	117,676	106,312
Total	121,279	108,723
Domestic credit card: | 30-59 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	1,179	773
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	1,179	773
Domestic credit card: | 60-89 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	817	528
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	817	528
Domestic credit card: | Greater than 90 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	1,607	1,110
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	1,607	1,110
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	3,603	2,411
International card businesses: | Credit Card
Financing Receivable, Past Due [Line Items]
Current	5,409	5,836
Total	5,634	6,049
International card businesses: | 30-59 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	79	77
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	79	77
International card businesses: | 60-89 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	53	50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	53	50
International card businesses: | Greater than 90 days | Credit Card
Financing Receivable, Past Due [Line Items]
Total	93	86
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent	93	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	$ 225	$ 213

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