Interim Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 533	$ 562
Change in foreign currency cumulative translation gains and losses:
Foreign currency translation (losses) gains	(9)	0
Related tax benefit	3	0
Change in unrealized gains and losses on AFS securities:
Unrealized holding gains (losses)	(978)	(823)
Related tax benefit	277	229
Reclassification adjustment for gains included in net income	(49)	0
Related tax expense	14	0
Cumulative-effect adjustment for unrealized gains on securities transferred from AFS to HTM	0	9
Related tax benefit (expense)	0	(3)
Amortization of unrealized holding net gains (losses) on securities transferred from AFS to HTM	3	(3)
Related tax (expense) benefit	(1)	1
Change in unrealized gains and losses on cash flow hedges:
Reclassification adjustment for losses (gains) included in net income	(15)	(16)
Related tax (benefit) expense	4	4
Other comprehensive income (loss), net of tax	(751)	(602)
Comprehensive income (loss)	(218)	(40)
Comprehensive (income) loss attributable to noncontrolling interests	(18)	(25)
Comprehensive income (loss) attributable to SVBFG	$ (236)	$ (65)