Loans, Allowance for Loan Losses and Allowance for Unfunded Credit Commitments - Credit Quality Indicators, Broken out by Risk-Based Segments and Vintage Year (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 5,395	$ 9,153
2020	6,745	4,008
2019	2,982	1,863
2018	1,255	934
2017	671	530
Prior	815	600
Revolving Loans	32,871	28,038
Revolving Loans Converted to Term Loans	47	55
Unallocated	(27)
Loans, amortized cost	50,754	45,181
Global fund banking
Financing Receivable, Credit Quality Indicator [Line Items]
2021	567	440
2020	165	48
2019	42	69
2018	55	23
2017	20	2
Prior	7	6
Revolving Loans	29,771	24,947
Revolving Loans Converted to Term Loans	3	8
Unallocated	0
Loans, amortized cost	30,630	25,543
Global fund banking \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	0	0
Global fund banking \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	567	440
2020	165	48
2019	42	69
2018	55	23
2017	20	2
Prior	7	6
Revolving Loans	29,766	24,947
Revolving Loans Converted to Term Loans	1	2
Unallocated	0
Loans, amortized cost	30,623	25,537
Global fund banking \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving Loans	5	0
Revolving Loans Converted to Term Loans	2	6
Unallocated	0
Loans, amortized cost	7	6
Investor dependent
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,495	2,544
2020	2,190	1,254
2019	825	528
2018	259	116
2017	43	10
Prior	9	17
Revolving Loans	501	494
Revolving Loans Converted to Term Loans	6	9
Unallocated	0
Loans, amortized cost	5,328	4,972
Investor dependent \| Early stage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	400	716
2020	614	452
2019	293	152
2018	71	43
2017	12	5
Prior	5	1
Revolving Loans	169	116
Revolving Loans Converted to Term Loans	1	1
Unallocated	0
Loans, amortized cost	1,565	1,486
Investor dependent \| Early stage \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	2
2020	1	9
2019	5	5
2018	4	1
2017	0	0
Prior	0	0
Revolving Loans	1	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	11	18
Investor dependent \| Early stage \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	392	667
2020	520	370
2019	237	121
2018	53	32
2017	10	1
Prior	0	1
Revolving Loans	144	96
Revolving Loans Converted to Term Loans	1	1
Unallocated	0
Loans, amortized cost	1,357	1,289
Investor dependent \| Early stage \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
2021	8	47
2020	93	73
2019	51	26
2018	14	10
2017	2	4
Prior	5	0
Revolving Loans	24	19
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	197	179
Investor dependent \| Mid stage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	513	883
2020	703	351
2019	226	172
2018	122	34
2017	19	5
Prior	2	6
Revolving Loans	118	111
Revolving Loans Converted to Term Loans	5	3
Unallocated	0
Loans, amortized cost	1,708	1,565
Investor dependent \| Mid stage \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	1
2019	2	0
2018	3	3
2017	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	5	4
Investor dependent \| Mid stage \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	505	840
2020	654	302
2019	215	146
2018	106	23
2017	16	5
Prior	2	1
Revolving Loans	100	101
Revolving Loans Converted to Term Loans	5	3
Unallocated	0
Loans, amortized cost	1,603	1,421
Investor dependent \| Mid stage \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
2021	8	43
2020	49	48
2019	9	26
2018	13	8
2017	3	0
Prior	0	5
Revolving Loans	18	10
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	100	140
Investor dependent \| Later stage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	582	945
2020	873	451
2019	306	204
2018	66	39
2017	12	0
Prior	2	10
Revolving Loans	214	267
Revolving Loans Converted to Term Loans	0	5
Unallocated	0
Loans, amortized cost	2,055	1,921
Investor dependent \| Later stage \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	17
2020	15	2
2019	0	4
2018	0	0
2017	0	0
Prior	0	0
Revolving Loans	6	6
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	21	29
Investor dependent \| Later stage \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	576	906
2020	829	394
2019	290	170
2018	63	38
2017	10	0
Prior	2	8
Revolving Loans	195	224
Revolving Loans Converted to Term Loans	0	5
Unallocated	0
Loans, amortized cost	1,965	1,745
Investor dependent \| Later stage \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
2021	6	22
2020	29	55
2019	16	30
2018	3	1
2017	2	0
Prior	0	2
Revolving Loans	13	37
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	69	147
Cash flow dependent
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,128	1,690
2020	1,292	1,115
2019	735	547
2018	365	333
2017	245	89
Prior	17	0
Revolving Loans	1,061	1,160
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	4,843	4,934
Cash flow dependent \| Sponsor led buyout
Financing Receivable, Credit Quality Indicator [Line Items]
2021	588	791
2020	562	534
2019	368	329
2018	191	196
2017	137	50
Prior	17	0
Revolving Loans	54	89
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	1,917	1,989
Cash flow dependent \| Sponsor led buyout \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	12
2019	12	16
2018	10	7
2017	7	0
Prior	0	0
Revolving Loans	5	5
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	34	40
Cash flow dependent \| Sponsor led buyout \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	588	791
2020	548	452
2019	341	274
2018	141	167
2017	120	37
Prior	4	0
Revolving Loans	44	75
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	1,786	1,796
Cash flow dependent \| Sponsor led buyout \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	14	70
2019	15	39
2018	40	22
2017	10	13
Prior	13	0
Revolving Loans	5	9
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	97	153
Cash flow dependent \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
2021	540	899
2020	730	581
2019	367	218
2018	174	137
2017	108	39
Prior	0	0
Revolving Loans	1,007	1,071
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	2,926	2,945
Cash flow dependent \| Other \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	5
2018	0	0
2017	0	0
Prior	0	0
Revolving Loans	1	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	1	6
Cash flow dependent \| Other \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	540	880
2020	720	513
2019	332	179
2018	137	133
2017	108	39
Prior	0	0
Revolving Loans	868	933
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	2,705	2,677
Cash flow dependent \| Other \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	19
2020	10	68
2019	35	34
2018	37	4
2017	0	0
Prior	0	0
Revolving Loans	138	137
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	220	262
Private bank
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,047	1,881
2020	1,749	1,163
2019	988	402
2018	330	354
2017	247	300
Prior	525	416
Revolving Loans	410	384
Revolving Loans Converted to Term Loans	1	1
Unallocated	0
Loans, amortized cost	5,297	4,901
Private bank \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	3
2018	6	0
2017	0	0
Prior	1	2
Revolving Loans	0	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	7	6
Private bank \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,047	1,878
2020	1,748	1,153
2019	980	394
2018	321	353
2017	243	295
Prior	513	406
Revolving Loans	406	382
Revolving Loans Converted to Term Loans	1	1
Unallocated	0
Loans, amortized cost	5,259	4,862
Private bank \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	3
2020	1	10
2019	8	5
2018	3	1
2017	4	5
Prior	11	8
Revolving Loans	4	1
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	31	33
Balance sheet dependent
Financing Receivable, Credit Quality Indicator [Line Items]
2021	657	894
2020	793	194
2019	172	199
2018	158	19
2017	31	0
Prior	0	0
Revolving Loans	992	884
Revolving Loans Converted to Term Loans	1	1
Unallocated	0
Loans, amortized cost	2,804	2,191
Balance sheet dependent \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	0	0
Balance sheet dependent \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	657	838
2020	728	190
2019	130	199
2018	158	19
2017	31	0
Prior	0	0
Revolving Loans	928	858
Revolving Loans Converted to Term Loans	0	1
Unallocated	0
Loans, amortized cost	2,632	2,105
Balance sheet dependent \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	56
2020	65	4
2019	42	0
2018	0	0
2017	0	0
Prior	0	0
Revolving Loans	64	26
Revolving Loans Converted to Term Loans	1	0
Unallocated	0
Loans, amortized cost	172	86
Premium wine
Financing Receivable, Credit Quality Indicator [Line Items]
2021	54	145
2020	143	218
2019	207	107
2018	88	89
2017	84	129
Prior	257	160
Revolving Loans	133	169
Revolving Loans Converted to Term Loans	36	36
Unallocated	0
Loans, amortized cost	1,002	1,053
Premium wine \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	1
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	0	1
Premium wine \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	52	127
2020	128	194
2019	195	71
2018	72	79
2017	74	115
Prior	210	154
Revolving Loans	112	135
Revolving Loans Converted to Term Loans	36	36
Unallocated	0
Loans, amortized cost	879	911
Premium wine \| Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2	18
2020	15	24
2019	12	36
2018	16	10
2017	10	13
Prior	47	6
Revolving Loans	21	34
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	123	141
Other
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	17	16
2019	13	11
2018	0	0
2017	1	0
Prior	0	1
Revolving Loans	3	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	(27)
Loans, amortized cost	7	28
Other \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Unallocated	0
Loans, amortized cost	0	0
Other \| Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0	0
2020	17	16
2019	13	11
2018	0	0
2017	1	0
Prior	0	1
Revolving Loans	3	0

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