Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Composition of Loans, Net of Unearned Income (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	$ 74,250	$ 66,276
Allowance for credit losses: loans	(636)	(422)	$ (448)	$ (305)
Net loans	73,614	65,854
Unearned income on loans	283	250
Credit card receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	555	583
Construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	539	367
Global fund banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	41,269	37,958
Allowance for credit losses: loans	(110)	(67)	(46)	(107)
Investor dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	6,713	5,544
Allowance for credit losses: loans	(273)	(146)	(213)	(82)
Investor dependent | Early stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,950	1,593
Investor dependent | Growth stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	4,763	3,951
Cash flow dependent and innovation C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses: loans	(155)	(118)	(125)	(81)
Cash flow dependent and innovation C&I | Cash flow dependent - SLBO
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,966	1,798
Cash flow dependent and innovation C&I | Innovation C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	8,609	6,673
Private Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	10,477	8,743
Allowance for credit losses: loans	(50)	(33)	(53)	(22)
CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	2,583	2,670
Allowance for credit losses: loans	(25)	(36)	0
Premium wine and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses: loans	(10)	(8)	(9)	(13)
Premium wine and other | Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,158	985
Premium wine and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	433	317
Other C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,019	1,257
Allowance for credit losses: loans	(13)	(14)	0
PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	$ 23	331
Allowance for credit losses: loans		$ 0	$ (2)	$ 0