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Loans - Wholesale Loan Portfolio, Defaults of FDMs (Details) - Wholesale - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Secured by real estate
Financing Receivable, Modified [Line Items]
FDM's that defaulted	$ 3	$ 1	$ 39	$ 1
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	3	1	39	1
Secured by real estate \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0	0	0	0
Secured by real estate \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0	0	0	0
Commercial and industrial
Financing Receivable, Modified [Line Items]
FDM's that defaulted	43	203	88	213
Commitments to lend to borrowers experiencing financial difficulty	2,300		2,300		$ 1,800
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	31	80	72	88
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	12	123	12	124
Commercial and industrial \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0	0	4	1
Other
Financing Receivable, Modified [Line Items]
FDM's that defaulted	15	10	25	12
Commitments to lend to borrowers experiencing financial difficulty	7		7		$ 69
Other \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	15	10	25	12
Other \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0	0	0	0
Other \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	$ 0	$ 0	$ 0	$ 0