Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 2,073	$ 1,294	$ 1,185
Change in foreign currency cumulative translation gains and losses:
Foreign currency translation (losses) gains	(2)	16	3
Related tax benefit (expense)	0	(5)	(1)
Change in unrealized gains and losses on available-for-sale securities:
Unrealized holding (losses) gains	(644)	606	190
Related tax benefit (expense)	179	(168)	(53)
Reclassification adjustment for (gains) losses included in net income	(31)	(61)	4
Related tax expense (benefit)	9	17	(1)
Cumulative-effect adjustment for unrealized losses on securities transferred from AFS to HTM	(132)	0	0
Related tax benefit	37	0	0
Amortization of unrealized holding (gains) losses on securities transferred from available-for-sale to held-to-maturity	(1)	2	(2)
Related tax expense (benefit)	0	(1)	1
Change in unrealized gains and losses on cash flow hedges:
Unrealized gains (losses)	0	232	(8)
Related tax (expense) benefit	0	(64)	2
Reclassification adjustment for (gains) losses included in net income	(63)	(50)	5
Related tax expense (benefit)	17	14	(2)
Other comprehensive (loss) income, net of tax	(632)	538	139
Comprehensive income	1,441	1,832	1,324
Comprehensive income attributable to noncontrolling interests	(240)	(86)	(48)
Comprehensive income attributable to SVBFG	$ 1,201	$ 1,746	$ 1,276