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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Interest income for loans classified as nonperforming	$ 4	$ 6	$ 54	$ 70
> 90 Days and Accruing	4,907		4,907		$ 3,807
Nonperforming Loans	1,865		1,865		1,995
Nonperforming Loans Without an Allowance	$ 672		$ 672		$ 846
Percentage, 90 Days Past Due and Accruing	1.11%		1.11%		1.16%
Percentage, Nonperforming Loans	0.42%		0.42%		0.61%
Percentage, Nonperforming Loans Without an Allowance	0.15%		0.15%		0.26%
Credit Card:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	$ 4,867		$ 4,867		$ 3,711
Nonperforming Loans	25		25		10
Nonperforming Loans Without an Allowance	0		0		0
Credit Card: | Personal loans
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	47		47
Nonperforming Loans	13		13
Nonperforming Loans Without an Allowance	0		0
Credit Card: | Domestic credit card:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	4,675		4,675		3,577
Nonperforming Loans Without an Allowance	0		0		0
Credit Card: | International card businesses:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	145		145		134
Nonperforming Loans	12		12		10
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	604		604		775
Nonperforming Loans Without an Allowance	10		10		12
Consumer Banking: | Auto
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		0
Nonperforming Loans	584		584		750
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	20		20		25
Nonperforming Loans Without an Allowance	10		10		12
Commercial Banking:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	40		40		96
Nonperforming Loans	1,236		1,236		1,210
Nonperforming Loans Without an Allowance	662		662		834
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	40		40		0
Nonperforming Loans	353		353		509
Nonperforming Loans Without an Allowance	198		198		227
Commercial Banking: | Commercial and industrial
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		96
Nonperforming Loans	883		883		701
Nonperforming Loans Without an Allowance	$ 464		$ 464		$ 607

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