Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Credit Quality Indicators, Broken out by Risk-Based Segments and Vintage Year (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	$ 8,623	$ 11,032
Year Two	8,711	5,880
Year Three	4,127	3,045
Year Four	2,154	1,279
Year Five	835	1,006
Prior	2,696	2,462
Revolving Loans	44,967	41,516
Revolving Loans Converted to Term Loans	60	77
Unallocated	(44)	(21)
Loans, amortized cost	72,129	66,276
Global fund banking
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	512	814
Year Two	95	133
Year Three	63	36
Year Four	31	6
Year Five	1	8
Prior	10	5
Revolving Loans	39,625	36,956
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	40,337	37,958
Global fund banking \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	0	0
Global fund banking \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	512	764
Year Two	95	115
Year Three	63	36
Year Four	31	6
Year Five	1	8
Prior	10	4
Revolving Loans	39,616	36,955
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	40,328	37,888
Global fund banking \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	50
Year Two	0	18
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	1
Revolving Loans	9	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	9	70
Investor dependent
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2,645	3,053
Year Two	2,456	1,374
Year Three	515	448
Year Four	129	117
Year Five	35	23
Prior	9	2
Revolving Loans	515	522
Revolving Loans Converted to Term Loans	5	5
Unallocated	0	0
Loans, amortized cost	6,309	5,544
Investor dependent \| Early stage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	795	820
Year Two	749	379
Year Three	100	155
Year Four	43	31
Year Five	2	6
Prior	3	1
Revolving Loans	219	201
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,911	1,593
Investor dependent \| Early stage \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1	2
Year Two	1	5
Year Three	0	3
Year Four	0	0
Year Five	0	0
Prior	0	0
Revolving Loans	2	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	4	11
Investor dependent \| Early stage \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	727	754
Year Two	626	287
Year Three	73	122
Year Four	36	26
Year Five	2	6
Prior	1	1
Revolving Loans	191	171
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,656	1,367
Investor dependent \| Early stage \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	67	64
Year Two	122	87
Year Three	27	30
Year Four	7	5
Year Five	0	0
Prior	2	0
Revolving Loans	26	29
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	251	215
Investor dependent \| Growth stage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,850	2,233
Year Two	1,707	995
Year Three	415	293
Year Four	86	86
Year Five	33	17
Prior	6	1
Revolving Loans	296	321
Revolving Loans Converted to Term Loans	5	5
Unallocated	0	0
Loans, amortized cost	4,398	3,951
Investor dependent \| Growth stage \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	19	2
Year Two	18	0
Year Three	2	1
Year Four	0	2
Year Five	0	0
Prior	0	0
Revolving Loans	4	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	43	6
Investor dependent \| Growth stage \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,684	2,072
Year Two	1,456	910
Year Three	360	265
Year Four	72	78
Year Five	28	14
Prior	6	1
Revolving Loans	243	286
Revolving Loans Converted to Term Loans	5	5
Unallocated	0	0
Loans, amortized cost	3,854	3,631
Investor dependent \| Growth stage \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	147	159
Year Two	233	85
Year Three	53	27
Year Four	14	6
Year Five	5	3
Prior	0	0
Revolving Loans	49	34
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	501	314
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Cash flow dependent - SLBO
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	698	875
Year Two	609	384
Year Three	215	284
Year Four	205	107
Year Five	20	83
Prior	61	15
Revolving Loans	37	50
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,845	1,798
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Cash flow dependent - SLBO \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	12
Year Four	0	10
Year Five	5	7
Prior	0	0
Revolving Loans	2	5
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	7	34
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Cash flow dependent - SLBO \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	678	875
Year Two	609	384
Year Three	199	252
Year Four	203	72
Year Five	14	76
Prior	39	2
Revolving Loans	30	35
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,772	1,696
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Cash flow dependent - SLBO \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	20	0
Year Two	0	0
Year Three	16	20
Year Four	2	25
Year Five	1	0
Prior	22	13
Revolving Loans	5	10
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	66	68
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Innovation C&I
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,837	2,294
Year Two	1,882	1,188
Year Three	894	350
Year Four	198	135
Year Five	29	58
Prior	54	0
Revolving Loans	3,427	2,648
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	8,321	6,673
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Innovation C&I \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Revolving Loans	1	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1	1
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Innovation C&I \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,788	2,230
Year Two	1,734	1,058
Year Three	773	288
Year Four	166	123
Year Five	18	58
Prior	54	0
Revolving Loans	3,102	2,411
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	7,635	6,168
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Innovation C&I \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	49	64
Year Two	148	130
Year Three	121	62
Year Four	32	12
Year Five	11	0
Prior	0	0
Revolving Loans	324	236
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	685	504
Private bank
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2,210	2,952
Year Two	2,833	2,015
Year Three	1,754	1,126
Year Four	952	529
Year Five	442	434
Prior	1,077	969
Revolving Loans	829	710
Revolving Loans Converted to Term Loans	5	8
Unallocated	0	0
Loans, amortized cost	10,102	8,743
Private bank \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	1	2
Year Four	2	9
Year Five	1	0
Prior	8	8
Revolving Loans	1	2
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	13	21
Private bank \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2,210	2,952
Year Two	2,817	2,015
Year Three	1,753	1,122
Year Four	948	520
Year Five	441	432
Prior	1,054	952
Revolving Loans	818	705
Revolving Loans Converted to Term Loans	5	8
Unallocated	0	0
Loans, amortized cost	10,046	8,706
Private bank \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	16	0
Year Three	0	2
Year Four	2	0
Year Five	0	2
Prior	15	9
Revolving Loans	10	3
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	43	16
CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	408	329
Year Two	296	254
Year Three	232	463
Year Four	380	192
Year Five	167	283
Prior	1,008	1,007
Revolving Loans	113	128
Revolving Loans Converted to Term Loans	5	14
Unallocated	0	0
Loans, amortized cost	2,609	2,670
CRE \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	5
Year Four	5	0
Year Five	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	5	5
CRE \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	406	326
Year Two	292	215
Year Three	181	344
Year Four	240	155
Year Five	143	236
Prior	894	868
Revolving Loans	96	110
Revolving Loans Converted to Term Loans	5	2
Unallocated	0	0
Loans, amortized cost	2,257	2,256
CRE \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2	3
Year Two	4	39
Year Three	51	114
Year Four	135	37
Year Five	24	47
Prior	114	139
Revolving Loans	17	18
Revolving Loans Converted to Term Loans	0	12
Unallocated	0	0
Loans, amortized cost	347	409
Premium wine and other \| Premium wine
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	256	218
Year Two	218	119
Year Three	91	167
Year Four	144	78
Year Five	56	71
Prior	153	162
Revolving Loans	165	136
Revolving Loans Converted to Term Loans	34	34
Unallocated	0	0
Loans, amortized cost	1,117	985
Premium wine and other \| Premium wine \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	0	0
Premium wine and other \| Premium wine \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	255	217
Year Two	213	112
Year Three	91	156
Year Four	137	69
Year Five	47	71
Prior	144	162
Revolving Loans	156	125
Revolving Loans Converted to Term Loans	34	34
Unallocated	0	0
Loans, amortized cost	1,077	946
Premium wine and other \| Premium wine \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1	1
Year Two	5	7
Year Three	0	11
Year Four	7	9
Year Five	9	0
Prior	9	0
Revolving Loans	9	11
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	40	39
Premium wine and other \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	25	61
Year Two	154	151
Year Three	189	83
Year Four	39	20
Year Five	0	16
Prior	0	0
Revolving Loans	11	7
Revolving Loans Converted to Term Loans	0	0
Unallocated	(44)	(21)
Loans, amortized cost	374	317
Premium wine and other \| Other \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	0	0
Premium wine and other \| Other \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	25	61
Year Two	151	144
Year Three	172	82
Year Four	30	20
Year Five	0	14
Prior	0	0
Revolving Loans	11	7
Revolving Loans Converted to Term Loans	0	0
Unallocated	(44)	(21)
Loans, amortized cost	345	307
Premium wine and other \| Other \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	3	7
Year Three	17	1
Year Four	9	0
Year Five	0	2
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	29	10
Other C&I
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	32	186
Year Two	149	181
Year Three	165	88
Year Four	76	95
Year Five	85	30
Prior	324	302
Revolving Loans	245	359
Revolving Loans Converted to Term Loans	11	16
Unallocated	0	0
Loans, amortized cost	1,087	1,257
Other C&I \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	1	0
Year Four	0	2
Year Five	1	0
Prior	1	1
Revolving Loans	0	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	3	4
Other C&I \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	31	181
Year Two	149	175
Year Three	161	82
Year Four	70	86
Year Five	81	28
Prior	304	301
Revolving Loans	234	350
Revolving Loans Converted to Term Loans	10	11
Unallocated	0	0
Loans, amortized cost	1,040	1,214
Other C&I \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1	5
Year Two	0	6
Year Three	3	6
Year Four	6	7
Year Five	3	2
Prior	19	0
Revolving Loans	11	8

Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Credit Quality Indicators, Broken out by Risk-Based Segments and Vintage Year (Details) - USD ($)
$ in Millions