Segment Reporting - Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net interest income	$ 1,198	$ 852	$ 3,447	$ 2,240
(Provision for) reduction of credit losses	(72)	(21)	(279)	(75)
Noninterest income (loss)	359	672	1,238	2,177
Noninterest expense	(892)	(879)	(2,613)	(2,168)
Income before income tax expense	593	624	1,793	2,174
Total average loans, amortized cost	71,098	59,291	69,158	51,843
Total average assets	215,740	182,690	216,652	152,952
Total average deposits	185,556	163,392	189,428	136,113
Goodwill	375		375		$ 375
Silicon Valley Bank
Segment Reporting Information [Line Items]
Noninterest income (loss)	308	182	781	514
SVB Private
Segment Reporting Information [Line Items]
Noninterest income (loss)	22	25	72	28
SVB Capital
Segment Reporting Information [Line Items]
Noninterest income (loss)	(54)	145	(78)	389
SVB Securities
Segment Reporting Information [Line Items]
Noninterest income (loss)	100	131	352	450
Operating segments | Silicon Valley Bank
Segment Reporting Information [Line Items]
Net interest income	1,107	766	2,993	2,084
(Provision for) reduction of credit losses	(32)	29	(174)	(27)
Noninterest income (loss)	308	182	781	514
Noninterest expense	(381)	(336)	(1,148)	(911)
Income before income tax expense	1,002	641	2,452	1,660
Total average loans, amortized cost	55,177	44,789	53,855	41,591
Total average assets	175,620	151,352	178,209	130,177
Total average deposits	172,427	148,879	175,370	128,006
Operating segments | SVB Private
Segment Reporting Information [Line Items]
Net interest income	111	74	296	146
(Provision for) reduction of credit losses	3	(20)	(9)	(16)
Noninterest income (loss)	22	25	72	28
Noninterest expense	(85)	(93)	(267)	(126)
Income before income tax expense	51	(14)	92	32
Total average loans, amortized cost	15,181	13,515	14,711	8,610
Total average assets	17,032	15,930	16,456	9,459
Total average deposits	12,436	13,431	13,327	7,108
Operating segments | SVB Capital
Segment Reporting Information [Line Items]
Net interest income	0	0	0	0
(Provision for) reduction of credit losses	0	0	0	0
Noninterest income (loss)	(54)	145	(78)	389
Noninterest expense	(17)	(15)	(53)	(48)
Income before income tax expense	(71)	130	(131)	341
Total average loans, amortized cost	0	0	0	0
Total average assets	883	730	956	641
Total average deposits	0	0	0	0
Operating segments | SVB Securities
Segment Reporting Information [Line Items]
Net interest income	1	0	1	0
(Provision for) reduction of credit losses	0	0	0	0
Noninterest income (loss)	100	131	352	450
Noninterest expense	(131)	(142)	(406)	(376)
Income before income tax expense	(30)	(11)	(53)	74
Total average loans, amortized cost	0	0	0	0
Total average assets	898	837	912	778
Total average deposits	0	0	0	0
Goodwill	174	138	174	138
Operating segments | Private bank
Segment Reporting Information [Line Items]
Goodwill	201	201	201	201
Other Items
Segment Reporting Information [Line Items]
Net interest income	(21)	12	157	10
(Provision for) reduction of credit losses	(43)	(30)	(96)	(32)
Noninterest income (loss)	(17)	189	111	796
Noninterest expense	(278)	(293)	(739)	(707)
Income before income tax expense	(359)	(122)	(567)	67
Total average loans, amortized cost	740	987	592	1,642
Total average assets	21,307	13,841	20,119	11,897
Total average deposits	$ 693	$ 1,082	$ 731	$ 999