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Loans - Wholesale Loan Portfolio, Defaults of FDMs (Details) - Wholesale - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Secured by real estate
Financing Receivable, Modified [Line Items]
FDM's that defaulted	$ 1,000,000	$ 0	$ 1,000,000	$ 2,000,000
Commitments to lend to borrowers experiencing financial difficulty	0		0		$ 0
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	1,000,000	0	1,000,000	1,000,000
Secured by real estate \| Other-than-insignificant payment deferral
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	0	1,000,000
Commercial and industrial
Financing Receivable, Modified [Line Items]
FDM's that defaulted	203,000,000	11,000,000	213,000,000	18,000,000
Commitments to lend to borrowers experiencing financial difficulty	1,200,000,000		1,200,000,000		1,800,000,000
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	80,000,000	11,000,000	88,000,000	18,000,000
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	123,000,000		124,000,000
Commercial and industrial \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	0	0	1,000,000	0
Other
Financing Receivable, Modified [Line Items]
FDM's that defaulted	10,000,000	32,000,000	12,000,000	32,000,000
Commitments to lend to borrowers experiencing financial difficulty	75,000,000		75,000,000		$ 4,000,000
Other \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	10,000,000	32,000,000	12,000,000	32,000,000
Other \| Other-than-insignificant payment deferral
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	$ 0	$ 0