Employee Compensation and Benefit Plans - Expenses Incurred Under Certain Employee Compensation and Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Incentive Compensation Plan	$ 352	$ 193	$ 144
Direct Drive Incentive Compensation Plan	64	38	37
Warrant Incentive Plan	71	34	15
SVBFG 401(k) Plan	40	30	26
SVBFG ESOP	14	6	4
SVB Securities
Segment Reporting Information [Line Items]
Incentive Compensation Plan	366	233	107
Retention Award	$ 10	$ 13	$ 12

Expense for annual sales incentive program.

No definition available.

Name:	sivb_DirectDriveIncentiveCompensationPlanExpense
Namespace Prefix:	sivb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Expense for annual cash incentive plan that rewards performance based on the entity's financial results and other performance criteria.

+ References

No definition available.

+ Details

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Namespace Prefix:	sivb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Retention Award Expense

+ References

No definition available.

+ Details

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Namespace Prefix:	sivb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Expense for warrant incentive plan which provides individual and team awards to those employees who negotiate warrants on the entity's behalf.

+ References

No definition available.

+ Details

Name:	sivb_WarrantIncentivePlanExpense
Namespace Prefix:	sivb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of plan compensation cost recognized during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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