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	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	$ 2,958	$ 11,032
Year Two	10,048	5,880
Year Three	5,285	3,045
Year Four	2,587	1,279
Year Five	1,127	1,006
Prior	3,214	2,462
Revolving Loans	43,409	41,516
Revolving Loans Converted to Term Loans	76	77
Unallocated	(39)	(21)
Loans, amortized cost	68,665	66,276
Global fund banking
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	292	814
Year Two	294	133
Year Three	122	36
Year Four	33	6
Year Five	4	8
Prior	12	5
Revolving Loans	38,587	36,956
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	39,344	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	292	764
Year Two	294	115
Year Three	122	36
Year Four	33	6
Year Five	4	8
Prior	12	4
Revolving Loans	38,587	36,955
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	39,344	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	0	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	0	70
Investor dependent
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	800	3,053
Year Two	2,903	1,374
Year Three	1,073	448
Year Four	259	117
Year Five	80	23
Prior	20	2
Revolving Loans	600	522
Revolving Loans Converted to Term Loans	4	5
Unallocated	0	0
Loans, amortized cost	5,739	5,544
Investor dependent \| Early stage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	244	820
Year Two	852	379
Year Three	265	155
Year Four	95	31
Year Five	19	6
Prior	5	1
Revolving Loans	227	201
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,707	1,593
Investor dependent \| Early stage \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	2
Year Two	2	5
Year Three	1	3
Year Four	0	0
Year Five	0	0
Prior	1	0
Revolving Loans	1	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	5	11
Investor dependent \| Early stage \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	236	754
Year Two	769	287
Year Three	195	122
Year Four	75	26
Year Five	14	6
Prior	2	1
Revolving Loans	194	171
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,485	1,367
Investor dependent \| Early stage \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	8	64
Year Two	81	87
Year Three	69	30
Year Four	20	5
Year Five	5	0
Prior	2	0
Revolving Loans	32	29
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	217	215
Investor dependent \| Growth stage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	556	2,233
Year Two	2,051	995
Year Three	808	293
Year Four	164	86
Year Five	61	17
Prior	15	1
Revolving Loans	373	321
Revolving Loans Converted to Term Loans	4	5
Unallocated	0	0
Loans, amortized cost	4,032	3,951
Investor dependent \| Growth stage \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	2
Year Two	1	0
Year Three	0	1
Year Four	1	2
Year Five	1	0
Prior	0	0
Revolving Loans	0	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	3	6
Investor dependent \| Growth stage \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	538	2,072
Year Two	1,878	910
Year Three	730	265
Year Four	144	78
Year Five	58	14
Prior	12	1
Revolving Loans	328	286
Revolving Loans Converted to Term Loans	4	5
Unallocated	0	0
Loans, amortized cost	3,692	3,631
Investor dependent \| Growth stage \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	18	159
Year Two	172	85
Year Three	78	27
Year Four	19	6
Year Five	2	3
Prior	3	0
Revolving Loans	45	34
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	337	314
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Cash flow dependent - SLBO
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	289	875
Year Two	753	384
Year Three	314	284
Year Four	240	107
Year Five	103	83
Prior	85	15
Revolving Loans	42	50
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,826	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	11	10
Year Five	9	7
Prior	7	0
Revolving Loans	5	5
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	32	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	289	875
Year Two	753	384
Year Three	298	252
Year Four	225	72
Year Five	68	76
Prior	65	2
Revolving Loans	29	35
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,727	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	0	0
Year Two	0	0
Year Three	16	20
Year Four	4	25
Year Five	26	0
Prior	13	13
Revolving Loans	8	10
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	67	68
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Innovation C&I
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	674	2,294
Year Two	2,221	1,188
Year Three	1,096	350
Year Four	283	135
Year Five	88	58
Prior	57	0
Revolving Loans	2,841	2,648
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	7,260	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	0	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	0	1
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Innovation C&I \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	673	2,230
Year Two	2,115	1,058
Year Three	977	288
Year Four	248	123
Year Five	76	58
Prior	57	0
Revolving Loans	2,635	2,411
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	6,781	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	1	64
Year Two	106	130
Year Three	119	62
Year Four	35	12
Year Five	12	0
Prior	0	0
Revolving Loans	206	236
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	479	504
Private bank
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	771	2,952
Year Two	2,929	2,015
Year Three	1,933	1,126
Year Four	1,048	529
Year Five	492	434
Prior	1,268	969
Revolving Loans	786	710
Revolving Loans Converted to Term Loans	8	8
Unallocated	0	0
Loans, amortized cost	9,235	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	7	0
Prior	9	8
Revolving Loans	2	2
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	21	21
Private bank \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	771	2,952
Year Two	2,929	2,015
Year Three	1,932	1,122
Year Four	1,044	520
Year Five	485	432
Prior	1,248	952
Revolving Loans	782	705
Revolving Loans Converted to Term Loans	8	8
Unallocated	0	0
Loans, amortized cost	9,199	8,706
Private bank \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	2
Year Four	2	0
Year Five	0	2
Prior	11	9
Revolving Loans	2	3
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	15	16
CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	93	329
Year Two	325	254
Year Three	251	463
Year Four	432	192
Year Five	162	283
Prior	1,212	1,007
Revolving Loans	106	128
Revolving Loans Converted to Term Loans	14	14
Unallocated	0	0
Loans, amortized cost	2,595	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	91	326
Year Two	323	215
Year Three	212	344
Year Four	310	155
Year Five	125	236
Prior	1,007	868
Revolving Loans	88	110
Revolving Loans Converted to Term Loans	2	2
Unallocated	0	0
Loans, amortized cost	2,158	2,256
CRE \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2	3
Year Two	2	39
Year Three	39	114
Year Four	117	37
Year Five	37	47
Prior	205	139
Revolving Loans	18	18
Revolving Loans Converted to Term Loans	12	12
Unallocated	0	0
Loans, amortized cost	432	409
Premium wine and other \| Premium wine
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	28	218
Year Two	218	119
Year Three	119	167
Year Four	155	78
Year Five	77	71
Prior	216	162
Revolving Loans	150	136
Revolving Loans Converted to Term Loans	34	34
Unallocated	0	0
Loans, amortized cost	997	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	28	217
Year Two	217	112
Year Three	112	156
Year Four	144	69
Year Five	68	71
Prior	206	162
Revolving Loans	140	125
Revolving Loans Converted to Term Loans	34	34
Unallocated	0	0
Loans, amortized cost	949	946
Premium wine and other \| Premium wine \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	1
Year Two	1	7
Year Three	7	11
Year Four	11	9
Year Five	9	0
Prior	10	0
Revolving Loans	10	11
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	48	39
Premium wine and other \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	5	61
Year Two	82	151
Year Three	168	83
Year Four	54	20
Year Five	20	16
Prior	16	0
Revolving Loans	10	7
Revolving Loans Converted to Term Loans	0	0
Unallocated	(36)	(21)
Loans, amortized cost	319	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	5	61
Year Two	82	144
Year Three	157	82
Year Four	53	20
Year Five	20	14
Prior	14	0
Revolving Loans	10	7
Revolving Loans Converted to Term Loans	0	0
Unallocated	(36)	(21)
Loans, amortized cost	305	307
Premium wine and other \| Other \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	7
Year Three	11	1
Year Four	1	0
Year Five	0	2
Prior	2	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	14	10
Other C&I
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	6	186
Year Two	177	181
Year Three	177	88
Year Four	83	95
Year Five	101	30
Prior	328	302
Revolving Loans	287	359
Revolving Loans Converted to Term Loans	16	16
Unallocated	0	0
Loans, amortized cost	1,175	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	1	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	4	4
Other C&I \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	6	181
Year Two	173	175
Year Three	170	82
Year Four	76	86
Year Five	93	28
Prior	322	301
Revolving Loans	276	350
Revolving Loans Converted to Term Loans	12	11
Unallocated	0	0
Loans, amortized cost	1,128	1,214
Other C&I \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	5
Year Two	4	6
Year Three	6	6
Year Four	7	7
Year Five	7	2
Prior	5	0
Revolving Loans	10	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