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Loans - Wholesale Loan Portfolio, Defaults of FDMs (Details) - Wholesale - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Secured by real estate
Financing Receivable, Modified [Line Items]
FDM's that defaulted	$ 4,000,000	$ 0	$ 9,000,000	$ 1,000,000
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	6,000,000	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 \| 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	3,000,000		3,000,000
Commercial and industrial
Financing Receivable, Modified [Line Items]
FDM's that defaulted	154,000,000	3,000,000	156,000,000	7,000,000
Commitments to lend to borrowers experiencing financial difficulty	849,000,000		849,000,000		1,800,000,000
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	110,000,000	3,000,000	111,000,000	7,000,000
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	23,000,000		23,000,000
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	20,000,000		20,000,000
Commercial and industrial \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	1,000,000		2,000,000
Other
Financing Receivable, Modified [Line Items]
FDM's that defaulted	9,000,000	0	11,000,000	0
Commitments to lend to borrowers experiencing financial difficulty	73,000,000		73,000,000		$ 4,000,000
Other \| Term extension
Financing Receivable, Modified [Line Items]
FDM's that defaulted	9,000,000	$ 0	11,000,000	$ 0
Other \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDM's that defaulted	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