Loans - Wholesale Loan Portfolio, Financial Effects of FDMs (Details) - Wholesale - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Secured by real estate
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 312	$ 347
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 305	$ 290
% of loan modifications to total retained credit card loans	0.18%	0.18%
Weighted-average term loan extensions	6 months	9 months
Secured by real estate \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 42
% of loan modifications to total retained credit card loans		0.03%
Weighted-average term loan extensions		35 months
Secured by real estate \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 7	$ 15
% of loan modifications to total retained credit card loans	0.00%	0.00%
Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 937	$ 707
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 527	$ 394
% of loan modifications to total retained credit card loans	0.28%	0.23%
Weighted-average term loan extensions	12 months	13 months
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 323	$ 312
% of loan modifications to total retained credit card loans	0.17%	0.18%
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 52
% of loan modifications to total retained credit card loans	0.03%
Weighted-average term loan extensions	8 months
Commercial and industrial \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 35	$ 1
% of loan modifications to total retained credit card loans	0.02%	0.00%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 107	$ 41
Other \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 107	$ 41
% of loan modifications to total retained credit card loans	0.02%	0.01%
Weighted-average term loan extensions	3 months	12 months

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

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