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	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)					113,334
Common stock issued under employee benefit plans, net of restricted stock cancellations	2				$ 0	2			2
Issuance of stock	972	$ 739		$ 739	$ 0	972			972	$ 739
Issuance of stock (in shares)					2,000,000
Net income	562						537		537		25
Capital calls and distributions, net	(12)										(12)
Other comprehensive income (loss), net of tax	(602)							(602)	(602)
Share-based compensation, net	27					27			27
Dividends on preferred stock	(5)						(5)		(5)
Other	5					(5)			5
Balance (in shares) at Mar. 31, 2021					54,001,797
Balance, end of period, net of tax at Mar. 31, 2021	10,121		1,079		$ 0	2,591	6,204	21	9,895		226
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)					91,687
Common stock issued under employee benefit plans, net of restricted stock cancellations	(27)				$ 0	(27)			(27)
Net income	533						515		515		18
Capital calls and distributions, net	(11)										(11)
Other comprehensive income (loss), net of tax	(751)							(751)	(751)
Share-based compensation, net	50					50			50
Dividends on preferred stock	(43)						(43)		(43)
Balance (in shares) at Mar. 31, 2022					58,840,156
Balance, end of period, net of tax at Mar. 31, 2022	$ 16,360		$ 3,646		$ 0	$ 5,180	$ 7,914	$ (760)	$ 15,980		$ 380