Segment Reporting - Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income	$ 4,485	$ 3,179	$ 2,157
Provision for credit losses	(420)	(123)	(220)
Noninterest income	1,728	2,738	1,840
Noninterest expense	(3,621)	(3,070)	(2,035)
Income before income tax expense	2,172	2,724	1,742
Total average loans, net of unearned income	70,289	54,547	37,266
Total average assets	216,103	166,011	85,792
Total average deposits	185,761	147,947	75,016
Silicon Valley Bank
Segment Reporting Information [Line Items]
Income before income tax expense	3,391	2,299
SVB Private Bank
Segment Reporting Information [Line Items]
Income before income tax expense	132	47
SVB Capital
Segment Reporting Information [Line Items]
Noninterest income	(110)	487	226
Income before income tax expense	(180)	416
SVB Securities
Segment Reporting Information [Line Items]
Income before income tax expense	(95)	48
Operating segments | Silicon Valley Bank
Segment Reporting Information [Line Items]
Net interest income	4,118	2,914	1,990
Provision for credit losses	(277)	(55)	(166)
Noninterest income	1,107	706	604
Noninterest expense	(1,557)	(1,266)	(1,011)
Income before income tax expense			1,417
Total average loans, net of unearned income	54,647	43,145	30,116
Total average assets	175,221	140,362	73,929
Total average deposits	172,106	138,057	71,911
Operating segments | SVB Private Bank
Segment Reporting Information [Line Items]
Net interest income	407	226	112
Provision for credit losses	(10)	(14)	(21)
Noninterest income	96	58	5
Noninterest expense	(361)	(223)	(55)
Income before income tax expense			41
Total average loans, net of unearned income	14,934	9,986	5,298
Total average assets	16,637	11,171	5,335
Total average deposits	12,884	8,924	2,388
Operating segments | SVB Capital
Segment Reporting Information [Line Items]
Net interest income	0	0	0
Provision for credit losses	0	0	0
Noninterest income	(110)	487	226
Noninterest expense	(70)	(71)	(51)
Income before income tax expense			175
Total average loans, net of unearned income	0	0	0
Total average assets	942	700	437
Total average deposits	0	0	0
Operating segments | SVB Securities
Segment Reporting Information [Line Items]
Net interest income	3	1	1
Provision for credit losses	0	0	0
Noninterest income	505	608	497
Noninterest expense	(603)	(561)	(379)
Income before income tax expense			119
Total average loans, net of unearned income	0	0	0
Total average assets	936	830	557
Total average deposits	0	0	0
Other Items
Segment Reporting Information [Line Items]
Net interest income	(43)	38	54
Provision for credit losses	(133)	(54)	(33)
Noninterest income	130	879	508
Noninterest expense	(1,030)	(949)	(539)
Income before income tax expense	(1,076)	(86)	(10)
Total average loans, net of unearned income	708	1,416	1,852
Total average assets	22,367	12,948	5,534
Total average deposits	$ 771	$ 966	$ 717