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	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	$ 68,665	$ 66,276
Loans Past Due 90 Days or More Still Accruing Interest	2	7
30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	79	63
60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	3	8
Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	16	20
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	98	91
Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	68,567	66,185
Global fund banking
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	39,344	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	39,344	37,958
Investor dependent
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	5,739	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	35	22
Investor dependent | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1	5
Investor dependent | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1	0
Investor dependent | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	37	27
Investor dependent | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	5,702	5,517
Investor dependent | Early stage
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,707	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	1	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	4	11
Investor dependent | Early stage | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,703	1,582
Investor dependent | Growth stage
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	4,032	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	33	16
Investor dependent | Growth stage | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Investor dependent | Growth stage | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
Investor dependent | Growth stage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	33	16
Investor dependent | Growth stage | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	3,999	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	1,826	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	0	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	0	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	1,826	1,798
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	7,260	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	7	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	1	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	8	14
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	7,252	6,659
Private bank
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	9,235	8,743
Loans Past Due 90 Days or More Still Accruing Interest	0	0
Private bank | 30 - 59   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	24	28
Private bank | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1	1
Private bank | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	11	12
Private bank | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	36	41
Private bank | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	9,199	8,702
CRE
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	2,595	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	0	0
CRE | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	0
CRE | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1	1
CRE | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	2,594	2,669
Premium wine and other | Premium wine
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	997	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	0	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	0	3
Premium wine and other | Premium wine | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	997	982
Premium wine and other | Other
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	319	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	319	317
Other C&I
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,175	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	12	1
Other C&I | 60 - 89   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	0	2
Other C&I | Equal to or Greater Than 90   Days Past   Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1	1
Other C&I | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	13	4
Other C&I | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	1,162	1,253
PPP Loans
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	175	331
Loans Past Due 90 Days or More Still Accruing Interest	2	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	3	0
PPP Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	3	1
PPP Loans | Current
Financing Receivable, Past Due [Line Items]
Loans, amortized cost	$ 172	$ 330