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Loans - Wholesale Loan Portfolio, Defaults of FDMs (Details) - Wholesale - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Secured by real estate
Financing Receivable, Modified [Line Items]
FDM's that defaulted	$ 11	$ 13
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	11	13
Secured by real estate \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0	0
Commercial and industrial
Financing Receivable, Modified [Line Items]
FDM's that defaulted	127	9
Commitments to lend to borrowers experiencing financial difficulty	930		$ 2,800
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	110	9
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	17	0
Other
Financing Receivable, Modified [Line Items]
FDM's that defaulted	25	11
Commitments to lend to borrowers experiencing financial difficulty	11		$ 73
Other \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	25	11
Other \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	$ 0	$ 0