Loans - Wholesale Loan Portfolio, Financial Effects of FDMs (Details) - Wholesale - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Secured by real estate
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 99	$ 271	$ 713	$ 327
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 64	$ 267	$ 620	$ 271
% of loan modifications to total retained credit card loans	0.04%	0.16%	0.38%	0.17%
Weighted-average term loan extensions	5 months	14 months	16 months	14 months
Secured by real estate \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 35		$ 50
% of loan modifications to total retained credit card loans	0.02%		0.03%
Secured by real estate \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 0		$ 42
% of loan modifications to total retained credit card loans	0.00%		0.03%
Weighted-average term loan extensions			37 months
Secured by real estate \| Other-than-insignificant payment deferral and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 0		$ 47
% of loan modifications to total retained credit card loans		0.00%		0.03%
Weighted-average contractual interest rate reduction				1.62%
Secured by real estate \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 0	$ 4	$ 1	$ 9
% of loan modifications to total retained credit card loans	0.00%	0.00%	0.00%	0.01%
Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 876	$ 664	$ 1,998	$ 1,348
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 361	$ 443	$ 894	$ 880
% of loan modifications to total retained credit card loans	0.20%	0.27%	0.50%	0.54%
Weighted-average term loan extensions	27 months	15 months	24 months	17 months
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 389	$ 215	$ 746	$ 315
% of loan modifications to total retained credit card loans	0.22%	0.13%	0.42%	0.19%
Commercial and industrial \| Interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 23		$ 24
% of loan modifications to total retained credit card loans	0.01%		0.01%
Weighted-average contractual interest rate reduction	0.50%		0.54%
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 81	$ 1	$ 127	$ 127
% of loan modifications to total retained credit card loans	0.05%	0.00%	0.07%	0.08%
Weighted-average term loan extensions	22 months		20 months	22 months
Commercial and industrial \| Other-than-insignificant payment deferral and interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 2		$ 92
% of loan modifications to total retained credit card loans	0.00%		0.05%
Weighted-average term loan extensions			16 months
Weighted-average contractual interest rate reduction			10.61%
Commercial and industrial \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 1		$ 83
% of loan modifications to total retained credit card loans	0.00%		0.05%
Weighted-average term loan extensions			26 months
Weighted-average contractual interest rate reduction			6.47%
Commercial and industrial \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 19	$ 5	$ 32	$ 26
% of loan modifications to total retained credit card loans	0.01%	0.00%	0.02%	0.02%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 64	$ 260	$ 90	$ 288
Other \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 64	$ 260	$ 87	$ 282
% of loan modifications to total retained credit card loans	0.02%	0.07%	0.02%	0.08%
Weighted-average term loan extensions	6 months	30 months	11 months	29 months
Other \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 0	$ 0	$ 3	$ 6
% of loan modifications to total retained credit card loans	0.00%	0.00%	0.00%	0.00%

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

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