Loans - Wholesale Loan Portfolio, Financial Effects of FDMs (Details) - Wholesale - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Secured by real estate
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 367	$ 99	$ 634	$ 713
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 314	$ 64	$ 572	$ 620
% of loan modifications to total retained loans	0.19%	0.04%	0.34%	0.38%
Weighted-average term loan extensions	9 months	5 months	10 months	16 months
Secured by real estate \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 48	$ 35	$ 57	$ 50
% of loan modifications to total retained loans	0.03%	0.02%	0.03%	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 loans		0.00%		0.03%
Weighted-average term loan extensions				37 months
Secured by real estate \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 5	$ 0	$ 5	$ 1
% of loan modifications to total retained loans	0.00%	0.00%	0.00%	0.00%
Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 507	$ 876	$ 1,658	$ 1,998
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 393	$ 361	$ 1,086	$ 894
% of loan modifications to total retained loans	0.20%	0.20%	0.54%	0.50%
Weighted-average term loan extensions	17 months	27 months	23 months	24 months
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 72	$ 389	$ 404	$ 746
% of loan modifications to total retained loans	0.04%	0.22%	0.20%	0.42%
Commercial and industrial \| Interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 23		$ 24
% of loan modifications to total retained 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	$ 27	$ 81	$ 139	$ 127
% of loan modifications to total retained loans	0.01%	0.05%	0.07%	0.07%
Weighted-average term loan extensions	12 months	22 months	12 months	20 months
Commercial and industrial \| Other-than-insignificant payment deferral, interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 2		$ 92
% of loan modifications to total retained 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 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	$ 15	$ 19	$ 29	$ 32
% of loan modifications to total retained loans	0.01%	0.01%	0.01%	0.02%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 81	$ 64	$ 207	$ 90
Other \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 81	$ 64	$ 178	$ 87
% of loan modifications to total retained loans	0.02%	0.02%	0.03%	0.02%
Weighted-average term loan extensions	3 months	6 months	52 months	11 months
Other \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 0	$ 0	$ 29	$ 3
% of loan modifications to total retained loans	0.00%	0.00%	0.01%	0.00%

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

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