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	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	$ 6,003	$ 11,032
Year Two	9,355	5,880
Year Three	4,577	3,045
Year Four	2,323	1,279
Year Five	986	1,006
Prior	2,890	2,462
Revolving Loans	44,798	41,516
Revolving Loans Converted to Term Loans	70	77
Unallocated	(47)	(21)
Loans, amortized cost	70,955	66,276
Global fund banking
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	415	814
Year Two	176	133
Year Three	101	36
Year Four	32	6
Year Five	3	8
Prior	11	5
Revolving Loans	39,578	36,956
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	40,316	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	415	764
Year Two	176	115
Year Three	101	36
Year Four	32	6
Year Five	3	8
Prior	11	4
Revolving Loans	39,578	36,955
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	40,316	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	1,726	3,053
Year Two	2,720	1,374
Year Three	723	448
Year Four	178	117
Year Five	51	23
Prior	14	2
Revolving Loans	603	522
Revolving Loans Converted to Term Loans	0	5
Unallocated	0	0
Loans, amortized cost	6,015	5,544
Investor dependent \| Early stage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	534	820
Year Two	840	379
Year Three	172	155
Year Four	64	31
Year Five	9	6
Prior	3	1
Revolving Loans	234	201
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,856	1,593
Investor dependent \| Early stage \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	2
Year Two	14	5
Year Three	5	3
Year Four	1	0
Year Five	2	0
Prior	0	0
Revolving Loans	1	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	23	11
Investor dependent \| Early stage \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	497	754
Year Two	710	287
Year Three	124	122
Year Four	51	26
Year Five	6	6
Prior	1	1
Revolving Loans	202	171
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,591	1,367
Investor dependent \| Early stage \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	37	64
Year Two	116	87
Year Three	43	30
Year Four	12	5
Year Five	1	0
Prior	2	0
Revolving Loans	31	29
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	242	215
Investor dependent \| Growth stage
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,192	2,233
Year Two	1,880	995
Year Three	551	293
Year Four	114	86
Year Five	42	17
Prior	11	1
Revolving Loans	369	321
Revolving Loans Converted to Term Loans	0	5
Unallocated	0	0
Loans, amortized cost	4,159	3,951
Investor dependent \| Growth stage \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	2
Year Two	19	0
Year Three	1	1
Year Four	5	2
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	26	6
Investor dependent \| Growth stage \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,115	2,072
Year Two	1,670	910
Year Three	488	265
Year Four	94	78
Year Five	34	14
Prior	8	1
Revolving Loans	307	286
Revolving Loans Converted to Term Loans	0	5
Unallocated	0	0
Loans, amortized cost	3,716	3,631
Investor dependent \| Growth stage \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	77	159
Year Two	191	85
Year Three	62	27
Year Four	15	6
Year Five	8	3
Prior	3	0
Revolving Loans	61	34
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	417	314
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Cash flow dependent - SLBO
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	484	875
Year Two	688	384
Year Three	222	284
Year Four	236	107
Year Five	99	83
Prior	80	15
Revolving Loans	50	50
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,859	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	9	7
Prior	0	0
Revolving Loans	2	5
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	11	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	484	875
Year Two	688	384
Year Three	206	252
Year Four	233	72
Year Five	89	76
Prior	57	2
Revolving Loans	41	35
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	1,798	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	3	25
Year Five	1	0
Prior	23	13
Revolving Loans	7	10
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	50	68
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Innovation C&I
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,231	2,294
Year Two	2,048	1,188
Year Three	1,013	350
Year Four	209	135
Year Five	56	58
Prior	55	0
Revolving Loans	3,141	2,648
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	7,753	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	2	0
Year Three	0	0
Year Four	0	0
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	6	1
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Innovation C&I \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,214	2,230
Year Two	1,910	1,058
Year Three	893	288
Year Four	177	123
Year Five	45	58
Prior	55	0
Revolving Loans	2,922	2,411
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	7,216	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	17	64
Year Two	136	130
Year Three	120	62
Year Four	32	12
Year Five	11	0
Prior	0	0
Revolving Loans	215	236
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	531	504
Private bank
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,668	2,952
Year Two	2,863	2,015
Year Three	1,792	1,126
Year Four	981	529
Year Five	457	434
Prior	1,125	969
Revolving Loans	877	710
Revolving Loans Converted to Term Loans	7	8
Unallocated	0	0
Loans, amortized cost	9,770	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	10	8
Revolving Loans	1	2
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	15	21
Private bank \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,668	2,952
Year Two	2,863	2,015
Year Three	1,791	1,122
Year Four	977	520
Year Five	456	432
Prior	1,104	952
Revolving Loans	873	705
Revolving Loans Converted to Term Loans	7	8
Unallocated	0	0
Loans, amortized cost	9,739	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	3	3
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	16	16
CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	272	329
Year Two	303	254
Year Three	242	463
Year Four	400	192
Year Five	155	283
Prior	1,118	1,007
Revolving Loans	110	128
Revolving Loans Converted to Term Loans	17	14
Unallocated	0	0
Loans, amortized cost	2,617	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	9	0
Year Five	0	0
Prior	1	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0	0
Loans, amortized cost	10	5
CRE \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	270	326
Year Two	299	215
Year Three	197	344
Year Four	253	155
Year Five	118	236
Prior	914	868
Revolving Loans	92	110
Revolving Loans Converted to Term Loans	5	2
Unallocated	0	0
Loans, amortized cost	2,148	2,256
CRE \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2	3
Year Two	4	39
Year Three	45	114
Year Four	138	37
Year Five	37	47
Prior	203	139
Revolving Loans	18	18
Revolving Loans Converted to Term Loans	12	12
Unallocated	0	0
Loans, amortized cost	459	409
Premium wine and other \| Premium wine
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	168	218
Year Two	218	119
Year Three	114	167
Year Four	146	78
Year Five	58	71
Prior	163	162
Revolving Loans	164	136
Revolving Loans Converted to Term Loans	34	34
Unallocated	0	0
Loans, amortized cost	1,065	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	168	217
Year Two	213	112
Year Three	113	156
Year Four	146	69
Year Five	49	71
Prior	153	162
Revolving Loans	154	125
Revolving Loans Converted to Term Loans	34	34
Unallocated	0	0
Loans, amortized cost	1,030	946
Premium wine and other \| Premium wine \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	1
Year Two	5	7
Year Three	1	11
Year Four	0	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	35	39
Premium wine and other \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	7	61
Year Two	115	151
Year Three	188	83
Year Four	61	20
Year Five	20	16
Prior	0	0
Revolving Loans	15	7
Revolving Loans Converted to Term Loans	0	0
Unallocated	(41)	(21)
Loans, amortized cost	365	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	7	61
Year Two	115	144
Year Three	175	82
Year Four	38	20
Year Five	20	14
Prior	0	0
Revolving Loans	15	7
Revolving Loans Converted to Term Loans	0	0
Unallocated	(41)	(21)
Loans, amortized cost	329	307
Premium wine and other \| Other \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	0	7
Year Three	13	1
Year Four	23	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	36	10
Other C&I
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	32	186
Year Two	173	181
Year Three	168	88
Year Four	80	95
Year Five	87	30
Prior	324	302
Revolving Loans	260	359
Revolving Loans Converted to Term Loans	12	16
Unallocated	0	0
Loans, amortized cost	1,136	1,257
Other 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	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	2	4
Other C&I \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	32	181
Year Two	169	175
Year Three	164	82
Year Four	74	86
Year Five	83	28
Prior	318	301
Revolving Loans	250	350
Revolving Loans Converted to Term Loans	10	11
Unallocated	0	0
Loans, amortized cost	1,100	1,214
Other C&I \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	5
Year Two	4	6
Year Three	4	6
Year Four	6	7
Year Five	3	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