Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions		Total	Noncumulative Preferred Stock	Cumulative adjustment for adoption of amendment	Preferred Stock	Preferred Stock Noncumulative Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative adjustment for adoption of amendment	Accumulated Other Comprehensive Income (Loss)	Total SVBFG Stockholders’ Equity	Total SVBFG Stockholders’ Equity Noncumulative Preferred Stock	Total SVBFG Stockholders’ Equity Cumulative adjustment for adoption of amendment	Noncontrolling Interests
Balance, beginning of period, net of tax at Dec. 31, 2019		$ 6,622			$ 340		$ 0	$ 1,470	$ 4,576		$ 85	$ 6,471			$ 151
Balance, beginning of period, net of tax (Accounting Standards Update 2017-08) at Dec. 31, 2019	[1]			$ (35)						$ (35)				$ (35)
Balance (in shares) at Dec. 31, 2019							51,655,607
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under share-based and employee benefit plans, net (in shares)							477,079
Common stock issued under share-based and employee benefit plans, net		31					$ 0	31				31
Net income		1,294							1,208			1,208			86
Capital calls and distributions, net		(24)													(24)
Other comprehensive income (loss), net of tax		538									538	538
Share-based compensation, net		84						84				84
Common stock repurchases (in shares)							(244,223)
Common stock repurchases		(60)					$ 0		(60)			(60)
Dividends on preferred stock		(17)							(17)			(17)
Balance, end of period, net of tax at Dec. 31, 2020		8,433			340		$ 0	1,585	5,672		623	8,220			213
Balance (in shares) at Dec. 31, 2020							51,888,463
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under share-based and employee benefit plans, net (in shares)							445,025
Common stock issued under share-based and employee benefit plans, net		11					$ 0	11				11
Issuance of stock (in shares)							4,527,000
Issuance of stock		2,363	$ 3,306			$ 3,306		2,363				2,363	$ 3,306
Issuance of common stock for the acquisition of Boston Private (in shares)							1,887,981
Issuance of common stock for the acquisition of Boston Private		1,060					$ 0	1,060				1,060
Net income		2,073							1,833			1,833			240
Capital calls and distributions, net		(80)													(80)
Other comprehensive income (loss), net of tax		(632)									(632)	(632)
Share-based compensation, net		138						138				138
Dividends on preferred stock		(63)							(63)			(63)
Balance, end of period, net of tax at Dec. 31, 2021		16,609			3,646		$ 0	5,157	7,442		(9)	16,236			373
Balance (in shares) at Dec. 31, 2021							58,748,469
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under share-based and employee benefit plans, net (in shares)							423,414
Common stock issued under share-based and employee benefit plans, net		(22)					$ 0	(22)				(22)
Net income		1,609							1,672			1,672			(63)
Capital calls and distributions, net		(19)													(19)
Other comprehensive income (loss), net of tax		(1,902)									(1,902)	(1,902)
Share-based compensation, net		183						183				183
Dividends on preferred stock		(163)							(163)			(163)
Balance, end of period, net of tax at Dec. 31, 2022		$ 16,295			$ 3,646		$ 0	$ 5,318	$ 8,951		$ (1,911)	$ 16,004			$ 291
Balance (in shares) at Dec. 31, 2022							59,171,883

[1] See Note 2- "Summary of Significant Accounting Policies" for additional details.