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Loans - 90+ Day Delinquent Loans Accruing Interest and Nonperforming Loans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	$ 3,456		$ 3,456		$ 3,554
Nonperforming Loans	2,071		2,071		1,528
Nonperforming Loans Without an Allowance	$ 880		$ 880		$ 547
Percentage, 90 Days Past Due and Accruing	1.08%		1.08%		1.11%
Percentage, Nonperforming Loans	0.65%		0.65%		0.48%
Percentage, Nonperforming Loans Without an Allowance	0.27%		0.27%		0.17%
Interest income for loans classified as nonperforming	$ 6	$ 11	$ 70	$ 47
Credit Card:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	3,456		3,456		$ 3,499
Nonperforming Loans	11		11		9
Nonperforming Loans Without an Allowance	0		0		0
Credit Card: | Domestic credit card:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	3,316		3,316		3,367
Nonperforming Loans Without an Allowance	0		0		0
Credit Card: | International card businesses:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	140		140		132
Nonperforming Loans	11		11		9
Nonperforming Loans Without an Allowance	0		0		0
Consumer Banking:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		0
Nonperforming Loans	712		712		758
Nonperforming Loans Without an Allowance	14		14		19
Consumer Banking: | Auto
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		0
Nonperforming Loans	685		685		712
Nonperforming Loans Without an Allowance	0		0		0
Consumer Banking: | Retail banking
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		0
Nonperforming Loans	27		27		46
Nonperforming Loans Without an Allowance	14		14		19
Commercial Banking:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		55
Nonperforming Loans	1,348		1,348		761
Nonperforming Loans Without an Allowance	866		866		528
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		0
Nonperforming Loans	630		630		425
Nonperforming Loans Without an Allowance	314		314		335
Commercial Banking: | Commercial and industrial
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		55
Nonperforming Loans	718		718		336
Nonperforming Loans Without an Allowance	$ 552		$ 552		$ 193

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