Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Composition of Loans, Net of Unearned Income (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	$ 66,276	$ 45,181
Allowance for credit losses: loans	(422)	(448)	$ (305)	$ (282)
Net loans	65,854	44,733
Unearned income on loans	250	226
Credit card receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	583	400
Construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	367	118
Global fund banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	37,958	25,543
Allowance for credit losses: loans	(67)	(46)	(107)	(94)
Investor dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	5,544	4,972
Allowance for credit losses: loans	(146)	(213)	(82)	(72)
Investor dependent | Early stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,593	1,486
Investor dependent | Growth stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	3,951	3,486
Cash flow dependent and innovation C&I (Commercial and Industrial)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses: loans	(118)	(125)	(81)	(88)
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	1,798	1,989
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I (Commercial and Industrial)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	6,673	5,136
Private Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	8,743	4,901
Allowance for credit losses: loans	(33)	(53)	(22)	(21)
CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	2,670	0
Allowance for credit losses: loans	(36)	0
Premium wine and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses: loans	(8)	(9)	(13)	$ (7)
Premium wine and other | Premium wine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	985	1,053
Premium wine and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	317	28
Other C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	1,257	0
Allowance for credit losses: loans	(14)	0
PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, amortized cost	331	1,559
Allowance for credit losses: loans	$ 0	$ (2)	$ 0