Interim Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Noncumulative Preferred Stock	Preferred Stock	Preferred Stock Noncumulative Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total SVBFG Stockholders’ Equity	Total SVBFG Stockholders’ Equity Noncumulative Preferred Stock	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2020					51,888,463
Balance, beginning of period, net of tax at Dec. 31, 2020	$ 8,433		$ 340		$ 0	$ 1,585	$ 5,672	$ 623	$ 8,220		$ 213
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)					341,844
Common stock issued under employee benefit plans, net of restricted stock cancellations	(3)				$ 0	(3)			(3)
Issuance of stock	1,118	$ 1,724		$ 1,724	$ 0	1,118			1,118	$ 1,724
Issuance of stock (in shares)					2,300,000
Net income	1,190						1,052		1,052		138
Capital calls and distributions, net	(51)										(51)
Other Comprehensive Income (Loss), Net of Tax	(481)							(481)	(481)
Share-based compensation, net	55					55			55
Dividends on preferred stock	(18)						(18)		(18)
Balance (in shares) at Jun. 30, 2021					54,530,307
Balance, end of period, net of tax at Jun. 30, 2021	11,967		2,064		$ 0	2,755	6,706	142	11,667		300
Balance (in shares) at Mar. 31, 2021					54,001,797
Balance, beginning of period, net of tax at Mar. 31, 2021	10,121		1,079		$ 0	2,591	6,204	21	9,895		226
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)					228,510
Common stock issued under employee benefit plans, net of restricted stock cancellations	(5)					(5)			(5)
Issuance of stock	146	$ 985		$ 985	$ 0	146			146	$ 985
Issuance of stock (in shares)					300,000
Net income	628						515		515		113
Capital calls and distributions, net	(39)										(39)
Other Comprehensive Income (Loss), Net of Tax	121							121	121
Share-based compensation, net	28					28			28
Dividends on preferred stock	(13)						(13)		(13)
Other	(5)					(5)			(5)
Balance (in shares) at Jun. 30, 2021					54,530,307
Balance, end of period, net of tax at Jun. 30, 2021	11,967		2,064		$ 0	2,755	6,706	142	11,667		300
Balance (in shares) at Dec. 31, 2021					58,748,469
Balance, beginning of period, net of tax at Dec. 31, 2021	16,609		3,646		$ 0	5,157	7,442	(9)	16,236		373
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)					332,857
Common stock issued under employee benefit plans, net of restricted stock cancellations	(29)				$ 0	(29)			(29)
Net income	886						888		888		(2)
Capital calls and distributions, net	(13)										(13)
Other Comprehensive Income (Loss), Net of Tax	(1,189)							(1,189)	(1,189)
Share-based compensation, net	95					95			95
Dividends on preferred stock	(83)						(83)		(83)
Balance (in shares) at Jun. 30, 2022					59,081,326
Balance, end of period, net of tax at Jun. 30, 2022	16,276		3,646		$ 0	5,223	8,247	(1,198)	15,918		358
Balance (in shares) at Mar. 31, 2022					58,840,156
Balance, beginning of period, net of tax at Mar. 31, 2022	16,360		3,646		$ 0	5,180	7,914	(760)	15,980		380
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)					241,170
Common stock issued under employee benefit plans, net of restricted stock cancellations	(2)					(2)			(2)
Net income	353						373		373		(20)
Capital calls and distributions, net	(2)										(2)
Other Comprehensive Income (Loss), Net of Tax	(438)							(438)	(438)
Share-based compensation, net	45					45			45
Dividends on preferred stock	(40)						(40)		(40)
Balance (in shares) at Jun. 30, 2022					59,081,326
Balance, end of period, net of tax at Jun. 30, 2022	$ 16,276		$ 3,646		$ 0	$ 5,223	$ 8,247	$ (1,198)	$ 15,918		$ 358