Parent Company Only Condensed Financial Information - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Statement of Income Captions [Line Items]
Changes in fair value on bank cash flow hedges, net of reclassification adjustments in bank net income	$ 43
Other comprehensive income (loss), net of tax	(1,902)	$ (632)	$ 538
Comprehensive income attributable to SVBFG	(230)	1,201	1,746
Parent Company
Condensed Statement of Income Captions [Line Items]
Net income before preferred stock dividend	1,672	1,833	1,208
Foreign currency translation gains (losses)	(37)	(1)	12
Changes in unrealized holding gains (losses) on AFS securities	(39)	(3)	0
Changes in fair value on bank cash flow hedges, net of reclassification adjustments in bank net income	(6)	(46)	131
Equity in other comprehensive income (loss) of bank and nonbank subsidiaries	(1,883)	(341)	395
Other comprehensive income (loss), net of tax	(1,965)	(391)	538
Comprehensive income attributable to SVBFG	$ (293)	$ 1,442	$ 1,746