Stockholders' Equity and EPS - QTD Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stockholders Equity Note [Line Items]
Balance, beginning of period, net of tax	$ 16,360	$ 10,121	$ 16,609	$ 8,433
Common stock issued under employee benefit plans, net of restricted stock cancellations	(2)	(5)	(29)	(3)
Issuance of stock		146		1,118
Net income	353	628	886	1,190
Capital calls and distributions, net	(2)	(39)	(13)	(51)
Other comprehensive income (loss), net of tax	(438)	121	(1,189)	(481)
Share-based compensation, net	45	28	95	55
Dividends on preferred stock	(40)	(13)	(83)	(18)
Other		(5)
Balance, end of period, net of tax	16,276	11,967	16,276	11,967
Noncumulative Preferred Stock
Stockholders Equity Note [Line Items]
Issuance of stock		985		1,724
Preferred Stock
Stockholders Equity Note [Line Items]
Balance, beginning of period, net of tax	3,646	1,079	3,646	340
Balance, end of period, net of tax	$ 3,646	2,064	$ 3,646	2,064
Preferred Stock | Noncumulative Preferred Stock
Stockholders Equity Note [Line Items]
Issuance of stock		$ 985		$ 1,724
Common Stock
Stockholders Equity Note [Line Items]
Balance (in shares)	58,840,156	54,001,797	58,748,469	51,888,463
Balance, beginning of period, net of tax	$ 0	$ 0	$ 0	$ 0
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)	241,170	228,510	332,857	341,844
Common stock issued under employee benefit plans, net of restricted stock cancellations			$ 0	$ 0
Issuance of stock (in shares)		300,000		2,300,000
Issuance of stock		$ 0		$ 0
Balance (in shares)	59,081,326	54,530,307	59,081,326	54,530,307
Balance, end of period, net of tax	$ 0	$ 0	$ 0	$ 0
Additional Paid-in Capital
Stockholders Equity Note [Line Items]
Balance, beginning of period, net of tax	5,180	2,591	5,157	1,585
Common stock issued under employee benefit plans, net of restricted stock cancellations	(2)	(5)	(29)	(3)
Issuance of stock		146		1,118
Share-based compensation, net	45	28	95	55
Other		(5)
Balance, end of period, net of tax	5,223	2,755	5,223	2,755
Retained Earnings
Stockholders Equity Note [Line Items]
Balance, beginning of period, net of tax	7,914	6,204	7,442	5,672
Net income	373	515	888	1,052
Dividends on preferred stock	(40)	(13)	(83)	(18)
Balance, end of period, net of tax	8,247	6,706	8,247	6,706
Accumulated Other Comprehensive Income (Loss)
Stockholders Equity Note [Line Items]
Balance, beginning of period, net of tax	(760)	21	(9)	623
Other comprehensive income (loss), net of tax	(438)	121	(1,189)	(481)
Balance, end of period, net of tax	(1,198)	142	(1,198)	142
Total SVBFG Stockholders’ Equity
Stockholders Equity Note [Line Items]
Balance, beginning of period, net of tax	15,980	9,895	16,236	8,220
Common stock issued under employee benefit plans, net of restricted stock cancellations	(2)	(5)	(29)	(3)
Issuance of stock		146		1,118
Net income	373	515	888	1,052
Other comprehensive income (loss), net of tax	(438)	121	(1,189)	(481)
Share-based compensation, net	45	28	95	55
Dividends on preferred stock	(40)	(13)	(83)	(18)
Other		(5)
Balance, end of period, net of tax	15,918	11,667	15,918	11,667
Total SVBFG Stockholders’ Equity | Noncumulative Preferred Stock
Stockholders Equity Note [Line Items]
Issuance of stock		985		1,724
Noncontrolling Interests
Stockholders Equity Note [Line Items]
Balance, beginning of period, net of tax	380	226	373	213
Net income	(20)	113	(2)	138
Capital calls and distributions, net	(2)	(39)	(13)	(51)
Balance, end of period, net of tax	$ 358	$ 300	$ 358	$ 300