Loans - Wholesale Loan Portfolio, Defaults of FDMs (Details) - Wholesale - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Secured by real estate
Financing Receivable, Modified [Line Items]
FDMs that defaulted	$ 173	$ 3	$ 6
Commitments to lend to borrowers experiencing financial difficulty	0	0
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
FDMs that defaulted	173	3	1
Secured by real estate \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDMs that defaulted	0	0	2
Secured by real estate \| Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
FDMs that defaulted	0	0	3
Commercial and industrial
Financing Receivable, Modified [Line Items]
FDMs that defaulted	65	210	50
Commitments to lend to borrowers experiencing financial difficulty	2,800	1,800
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
FDMs that defaulted	57	92	49
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDMs that defaulted	5	118	0
Commercial and industrial \| Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
FDMs that defaulted	3	0	1
Other
Financing Receivable, Modified [Line Items]
FDMs that defaulted	3	22	31
Commitments to lend to borrowers experiencing financial difficulty	73	69
Other \| Term extension
Financing Receivable, Modified [Line Items]
FDMs that defaulted	3	22	31
Other \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDMs that defaulted	0	0	0
Other \| Term extension and interest rate reduction
Financing Receivable, Modified [Line Items]
FDMs that defaulted	$ 0	$ 0	$ 0

Amortized cost excluding accrued interest, of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

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