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Loans - Wholesale Loan Portfolio, Defaults 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	Dec. 31, 2025
Secured by real estate
Financing Receivable, Modified [Line Items]
FDM's that defaulted	$ 11	$ 21	$ 11	$ 21
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	11	21	11	21
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 \| 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	23	44	249	57
Commitments to lend to borrowers experiencing financial difficulty	1,400		1,400		$ 2,800
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	11	40	47	49
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	2	4	192	4
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	10		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	3	4	13	12
Commitments to lend to borrowers experiencing financial difficulty	19		19		$ 73
Other \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	3	4	13	12
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