Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Summary of the Aging of Loans Broken out by Risk-based Segments (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	$ 72,129	$ 66,276
Loans Past Due 90 Days or More Still Accruing Interest	6	7
30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	43	63
60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	40	8
Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	19	20
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	102	91
Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	72,027	66,185
Global fund banking
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	40,337	37,958
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Global fund banking | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Global fund banking | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Global fund banking | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Global fund banking | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Global fund banking | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	40,337	37,958
Investor dependent
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	6,309	5,544
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Investor dependent | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	28	22
Investor dependent | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	15	5
Investor dependent | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	3	0
Investor dependent | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	46	27
Investor dependent | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	6,263	5,517
Investor dependent | Early stage
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,911	1,593
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Investor dependent | Early stage | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	2	6
Investor dependent | Early stage | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	2	5
Investor dependent | Early stage | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1	0
Investor dependent | Early stage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	5	11
Investor dependent | Early stage | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,906	1,582
Investor dependent | Growth stage
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	4,398	3,951
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Investor dependent | Growth stage | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	26	16
Investor dependent | Growth stage | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	13	0
Investor dependent | Growth stage | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	2	0
Investor dependent | Growth stage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	41	16
Investor dependent | Growth stage | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	4,357	3,935
Cash flow dependent and innovation C&I (Commercial and Industrial) | Cash flow dependent - SLBO
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,845	1,798
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Cash flow dependent and innovation C&I (Commercial and Industrial) | Cash flow dependent - SLBO | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	4	0
Cash flow dependent and innovation C&I (Commercial and Industrial) | Cash flow dependent - SLBO | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Cash flow dependent and innovation C&I (Commercial and Industrial) | Cash flow dependent - SLBO | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Cash flow dependent and innovation C&I (Commercial and Industrial) | Cash flow dependent - SLBO | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	4	0
Cash flow dependent and innovation C&I (Commercial and Industrial) | Cash flow dependent - SLBO | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,841	1,798
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	8,321	6,673
Loans Past Due 90 Days or More Still Accruing Interest	0	7
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	6	7
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	3	0
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	7
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	9	14
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	8,312	6,659
Private bank
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	10,102	8,743
Loans Past Due 90 Days or More Still Accruing Interest	1	0
Private bank | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1	28
Private bank | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	12	1
Private bank | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	5	12
Private bank | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	18	41
Private bank | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	10,084	8,702
CRE
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	2,609	2,670
Loans Past Due 90 Days or More Still Accruing Interest	0	0
CRE | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1	1
CRE | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	7	0
CRE | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	5	0
CRE | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	13	1
CRE | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	2,596	2,669
Other C&I
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,087	1,257
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Other C&I | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	1
Other C&I | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	3	2
Other C&I | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	1
Other C&I | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	3	4
Other C&I | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,084	1,253
Premium wine and other | Premium wine
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,117	985
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Premium wine and other | Premium wine | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	3	3
Premium wine and other | Premium wine | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Premium wine and other | Premium wine | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Premium wine and other | Premium wine | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	3	3
Premium wine and other | Premium wine | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,114	982
Premium wine and other | Other
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	374	317
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Premium wine and other | Other | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Premium wine and other | Other | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Premium wine and other | Other | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Premium wine and other | Other | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Premium wine and other | Other | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	374	317
PPP Loans
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	28	331
Loans Past Due 90 Days or More Still Accruing Interest	5	0
PPP Loans | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	1
PPP Loans | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
PPP Loans | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	6	0
PPP Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	6	1
PPP Loans | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	$ 22	$ 330