Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Composition of Loans, Net of Unearned Income (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	$ 72,129		$ 66,276
ACL	(557)	$ (545)	(422)	$ (398)	$ (396)	$ (448)
Net loans	71,572		65,854
Unearned income on loans	244		250
Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	582		583
Construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	454		367
Global fund banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	40,337		37,958
ACL	(91)	(89)	(67)	(59)	(66)	(46)
Investor dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	6,309		5,544
ACL	(234)	(224)	(146)	(138)	(158)	(213)
Investor dependent | Early stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,911		1,593
Investor dependent | Growth stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	4,398		3,951
Cash flow dependent and innovation C&I (Commercial and Industrial)
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL	(136)	(130)	(118)	(109)	(119)	(125)
Cash flow dependent and innovation C&I (Commercial and Industrial) | Cash flow dependent - SLBO
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,845		1,798
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	8,321		6,673
Private bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	10,102		8,743
ACL	(47)	(45)	(33)	(31)	(47)	(53)
CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	2,609		2,670
ACL	(27)	(34)	(36)	(40)	0	0
Other C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,087		1,257
ACL	(12)	(12)	(14)	(12)	0	0
Premium wine and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL	(10)	$ (11)	(8)	(9)	$ (6)	(9)
Premium wine and other | Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,117		985
PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	$ 28		$ 331
ACL				$ 0		$ (2)