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Loans - Wholesale Loan Portfolio, Defaults 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	Dec. 31, 2025
Secured by real estate
Financing Receivable, Modified [Line Items]
FDM's that defaulted	$ 52	$ 3	$ 56	$ 39
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	27	3	31	39
Secured by real estate \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	25	0	25	0
Secured by real estate \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0		0
Secured by real estate \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted		0		0
Commercial and industrial
Financing Receivable, Modified [Line Items]
FDM's that defaulted	26	43	240	88
Commitments to lend to borrowers experiencing financial difficulty	2,000		2,000		$ 2,800
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	26	31	50	72
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0	12	180	12
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0		10
Commercial and industrial \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted		0		4
Other
Financing Receivable, Modified [Line Items]
FDM's that defaulted	1	15	1	25
Commitments to lend to borrowers experiencing financial difficulty	103		103		$ 73
Other \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	1	15	1	25
Other \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0	0	0	0
Other \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	$ 0		$ 0
Other \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted		$ 0		$ 0