Parent Company Only Condensed Financial Information - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Statement of Income Captions [Line Items]
Changes in fair value on bank cash flow hedges, net of reclassification adjustments in bank net income	$ 83
Other comprehensive (loss) income, net of tax	(632)	$ 538	$ 139
Comprehensive income attributable to SVBFG	1,201	1,746	1,276
Parent Company
Condensed Statement of Income Captions [Line Items]
Net income before preferred stock dividend	1,833	1,208	1,137
Foreign currency translation gains (losses)	(1)	12	2
Changes in unrealized holding gains and losses on AFS securities	(3)	0	2
Changes in fair value on bank cash flow hedges, net of reclassification adjustments in bank net income	(46)	131	(2)
Equity in other comprehensive (loss) income of bank and nonbank subsidiaries	(341)	395	136
Other comprehensive (loss) income, net of tax	(391)	538	138
Comprehensive income attributable to SVBFG	$ 1,442	$ 1,746	$ 1,275