Shareholder Report, Line Graph (Details) |
6 Months Ended |
|---|---|
Jun. 30, 2026 | |
| C000009558 [Member] | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Davis Financial Portfolio |
| Standard & Poor's 500 Index [Member] | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | S&P 500 Index |
| S And P 500 Financials Index [Member] | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | S&P 500 Financials Index |