Loans - Wholesale Loan Portfolio, Financial Effects of FDMs (Details) - Wholesale - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Secured by real estate
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 178	$ 336	$ 251	$ 643
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 143	$ 336	$ 210	$ 585
% of loan modifications to total retained loans	0.09%	0.20%	0.13%	0.36%
Weighted-average term loan extensions	7 months	21 months	10 months	17 months
Secured by real estate \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 35	$ 0	$ 35	$ 42
% of loan modifications to total retained loans	0.02%	0.00%	0.02%	0.03%
Weighted-average term loan extensions	3 months		3 months	35 months
Secured by real estate \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 0	$ 0	$ 6	$ 16
% of loan modifications to total retained loans	0.00%	0.00%	0.00%	0.01%
Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 885	$ 1,030	$ 1,262	$ 1,487
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 522	$ 624	$ 740	$ 835
% of loan modifications to total retained loans	0.27%	0.36%	0.39%	0.48%
Weighted-average term loan extensions	20 months	16 months	18 months	19 months
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 342	$ 172	$ 399	$ 418
% of loan modifications to total retained loans	0.18%	0.10%	0.21%	0.24%
Commercial and industrial \| Other-than-insignificant payment deferral, interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 90		$ 90
% of loan modifications to total retained loans		0.05%		0.05%
Weighted-average term loan extensions		15 months		15 months
Weighted-average contractual interest rate reduction		10.76%		10.76%
Commercial and industrial \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 82		$ 82
% of loan modifications to total retained loans		0.05%		0.05%
Weighted-average term loan extensions		26 months		26 months
Weighted-average contractual interest rate reduction		6.55%		6.52%
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 16	$ 47	$ 103	$ 47
% of loan modifications to total retained loans	0.01%	0.03%	0.05%	0.03%
Weighted-average term loan extensions	2 months	26 months	7 months	26 months
Commercial and industrial \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 5	$ 15	$ 20	$ 15
% of loan modifications to total retained loans	0.00%	0.01%	0.01%	0.01%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 114	$ 112	$ 136	$ 143
Other \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 98	$ 109	$ 119	$ 140
% of loan modifications to total retained loans	0.02%	0.03%	0.02%	0.03%
Weighted-average term loan extensions	96 months	6 months	82 months	9 months
Other \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 16	$ 3	$ 17	$ 3
% of loan modifications to total retained 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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