Noninterest Income - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 368	$ 306	$ 720	$ 633
Revenues outside the scope of ASC 606	(6)	455	159	872
Noninterest income	362	761	879	1,505
Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	2	4	2
Revenues outside the scope of ASC 606	32	260	125	605
Noninterest income	35	262	129	607
Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	180	153	372	298
Revenues outside the scope of ASC 606	81	20	101	34
Noninterest income	261	173	473	332
SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22	2	46	3
Revenues outside the scope of ASC 606	2	0	3	0
Noninterest income	24	2	49	3
SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12	28	28	41
Revenues outside the scope of ASC 606	(101)	147	(52)	203
Noninterest income	(89)	175	(24)	244
SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	151	121	270	289
Revenues outside the scope of ASC 606	(20)	28	(18)	30
Noninterest income	131	149	252	319
Investment banking revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83	15	118	35
Investment banking revenue | Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	0	1	0
Investment banking revenue | Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	82	14	117	33
Investment banking revenue | SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	1	0	2
Investment banking revenue | SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Investment banking revenue | SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Wealth management and trust fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22		44
Wealth management and trust fees | Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
Wealth management and trust fees | Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
Wealth management and trust fees | SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22		44
Wealth management and trust fees | SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
Wealth management and trust fees | SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0		0
Spot contract commissions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	69	66	141	123
Card interchange fees, gross
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	61	49	118	90
Card interchange fees, gross | Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	1	2	1
Card interchange fees, gross | Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	60	47	116	88
Card interchange fees, gross | SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	1	0	1
Card interchange fees, gross | SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Card interchange fees, gross | SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Merchant service fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	4	11	8
Merchant service fees | Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Merchant service fees | Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	4	11	8
Merchant service fees | SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Merchant service fees | SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Merchant service fees | SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposit service charges
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	32	28	62	53
Deposit service charges | Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	1	1	1
Deposit service charges | Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	31	27	60	52
Deposit service charges | SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	1	0
Deposit service charges | SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposit service charges | SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Investment banking revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	125	103	218	245
Investment banking revenue | Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Investment banking revenue | Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Investment banking revenue | SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Investment banking revenue | SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Investment banking revenue | SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	125	103	218	245
Commissions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	24	17	49	41
Commissions | Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Commissions | Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Commissions | SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Commissions | SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Commissions | SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	24	17	49	41
Fund management fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14	21	27	36
Fund management fees | Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Fund management fees | Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Fund management fees | SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Fund management fees | SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12	20	24	33
Fund management fees | SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	1	3	3
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	69	73	125
Other | Other Items
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Silicon Valley Bank
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	61	68	117
Other | SVB Private
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	1	0
Other | SVB Capital
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	8	4	8
Other | SVB Securities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0