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Loans - 90+ Day Delinquent Loans Accruing Interest and Nonperforming Loans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Interest income for loans classified as nonperforming	$ 3	$ 6	$ 20	$ 31
> 90 Days and Accruing	4,668		4,668		$ 3,807
Nonperforming Loans	1,777		1,777		1,995
Nonperforming Loans Without an Allowance	$ 615		$ 615		$ 846
Percentage, 90 Days Past Due and Accruing	1.06%		1.06%		1.16%
Percentage, Nonperforming Loans	0.40%		0.40%		0.61%
Percentage, Nonperforming Loans Without an Allowance	0.14%		0.14%		0.26%
Credit Card:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	$ 4,582		$ 4,582		$ 3,711
Nonperforming Loans	23		23		10
Nonperforming Loans Without an Allowance	0		0		0
Credit Card: | Personal loans
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	45		45
Nonperforming Loans	11		11
Nonperforming Loans Without an Allowance	0		0
Credit Card: | Domestic credit card:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	4,393		4,393		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	144		144		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	603		603		775
Nonperforming Loans Without an Allowance	9		9		12
Consumer Banking: | Auto
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		0
Nonperforming Loans	585		585		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	18		18		25
Nonperforming Loans Without an Allowance	9		9		12
Commercial Banking:
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	86		86		96
Nonperforming Loans	1,151		1,151		1,210
Nonperforming Loans Without an Allowance	606		606		834
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	0		0		0
Nonperforming Loans	348		348		509
Nonperforming Loans Without an Allowance	176		176		227
Commercial Banking: | Commercial and industrial
Financing Receivable, Past Due [Line Items]
> 90 Days and Accruing	86		86		96
Nonperforming Loans	803		803		701
Nonperforming Loans Without an Allowance	$ 430		$ 430		$ 607

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