| Document and Entity Information | Oct. 31, 2023 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 31, 2023 |
| Entity Registrant Name | SVB Financial Group |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39154 |
| Entity Tax Identification Number | 91-1962278 |
| Entity Address Address Line 1 | 2270 Sand Hill Road |
| Entity Address City Or Town | Menlo Park |
| Entity Address State Or Province | CA |
| Entity Address Postal Zip Code | 94025 |
| City Area Code | 650 |
| Local Phone Number | 567-6900 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000719739 |
| Amendment Flag | false |
| Former Address [Member] | |
| Entity Information [Line Items] | |
| Entity Address Address Line 1 | 3003 Tasman Drive |
| Entity Address City Or Town | Santa Clara |
| Entity Address State Or Province | CA |
| Entity Address Postal Zip Code | 95054-1191 |
