Loans - Wholesale Loan Portfolio, Financial Effects of FDMs (Details) - Wholesale - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Secured by real estate
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 354	$ 160
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 271	$ 149
% of loan modifications to total retained credit card loans	0.17%	0.09%
Weighted-average term loan extensions	21 months	14 months
Secured by real estate \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 37	$ 3
% of loan modifications to total retained credit card loans	0.02%	0.00%
Secured by real estate \| Other-than-insignificant payment deferral and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 46	$ 5
% of loan modifications to total retained credit card loans	0.03%	0.00%
Weighted-average contractual interest rate reduction	1.62%	1.84%
Secured by real estate \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 3
% of loan modifications to total retained credit card loans		0.00%
Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 1,900	$ 1,363
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 1,180	$ 916
% of loan modifications to total retained credit card loans	0.71%	0.55%
Weighted-average term loan extensions	20 months	17 months
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 464	$ 402
% of loan modifications to total retained credit card loans	0.28%	0.24%
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 175	$ 35
% of loan modifications to total retained credit card loans	0.10%	0.02%
Weighted-average term loan extensions	18 months	7 months
Commercial and industrial \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 51	$ 1
% of loan modifications to total retained credit card loans	0.03%	0.00%
Weighted-average term loan extensions	36 months	16 months
Weighted-average contractual interest rate reduction	4.34%
Commercial and industrial \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 30	$ 9
% of loan modifications to total retained credit card loans	0.02%	0.00%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 275	$ 609
Other \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 268	$ 355
% of loan modifications to total retained credit card loans	0.07%	0.10%
Weighted-average term loan extensions	28 months	23 months
Other \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 2	$ 245
% of loan modifications to total retained credit card loans	0.00%	0.07%
Weighted-average term loan extensions	6 months	137 months
Other \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 5	$ 9
% of loan modifications to total retained credit card loans	0.00%	0.00%

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

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