S000017010 [Member] Performance Management - Franklin Multi-Asset Variable Moderate Growth |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance |
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund’s performance from year to year of Class I shares. The table shows the average annual total returns of Class I shares of the fund and also compares the fund’s performance with the average annual total returns of a broad measure of market performance, an additional index with characteristics relevant to the fund and a composite benchmark, which is a hypothetical representation of the performance of the portfolio’s major asset classes, consisting of 40% Russell 1000 Index, 15% Russell 2000 Index, 15% MSCI Europe, Australasia, Far East Index, 25% Bloomberg U.S. Aggregate Index and 5% Bloomberg U.S. High Yield—2% Issuer Cap Index. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes certain information, including its current net asset value, available at www.franklintempleton.com/prospectus (select fund and share class). Updated performance information can be obtained by calling the fund at 877-6LM-FUND/656-3863. The fund’s past performance is not necessarily an indication of how the fund will perform in the future. Fees paid by the separate accounts or qualified plans through which shares of the fund are sold are not reflected in the accompanying bar chart and table. If they were, the returns would be lower than those shown. Please refer to the separate account prospectus or information provided by your qualified plan for a description of the expenses associated with the account or plan.
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| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not necessarily an indication of how the fund will perform in the future. |
| Performance Information Illustrates Variability of Returns [Text] | The bar chart shows changes in the fund’s performance from year to year of Class I shares. The table shows the average annual total returns of Class I shares of the fund and also compares the fund’s performance with the average annual total returns of a broad measure of market performance, an additional index with characteristics relevant to the fund and a composite benchmark, which is a hypothetical representation of the performance of the portfolio’s major asset classes, consisting of 40% Russell 1000 Index, 15% Russell 2000 Index, 15% MSCI Europe, Australasia, Far East Index, 25% Bloomberg U.S. Aggregate Index and 5% Bloomberg U.S. High Yield—2% Issuer Cap Index. |
| Performance Additional Market Index [Text] | The table shows the average annual total returns of Class I shares of the fund and also compares the fund’s performance with the average annual total returns of a broad measure of market performance, an additional index with characteristics relevant to the fund and a composite benchmark, which is a hypothetical representation of the performance of the portfolio’s major asset classes, consisting of 40% Russell 1000 Index, 15% Russell 2000 Index, 15% MSCI Europe, Australasia, Far East Index, 25% Bloomberg U.S. Aggregate Index and 5% Bloomberg U.S. High Yield—2% Issuer Cap Index. |
| Bar Chart Does Not Reflect Sales Loads [Text] | Fees paid by the separate accounts or qualified plans through which shares of the fund are sold are not reflected in the accompanying bar chart and table. If they were, the returns would be lower than those shown. |
| Bar Chart [Heading] | Total returns (%) |
| Bar Chart Closing [Text Block] | Calendar Years ended December 31 Best Quarter (06/30/2020): 15.62 Worst Quarter (03/31/2020): (18.46) |
| Performance Table Heading | Average annual total returns (%)(for periods ended December 31, 2025) |
| Performance Table Narrative | Important data provider notices and terms are available at www.franklintempletondatasources.com. Such information is subject to change.
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| Performance Availability Website Address [Text] | www.franklintempleton.com/prospectus (select fund and share class) |
| Performance Availability Phone [Text] | 877-6LM-FUND/656-3863 |
| Class I | |
| Prospectus [Line Items] | |
| Highest Quarterly Return, Label [Optional Text] | Best Quarter |
| Highest Quarterly Return | 15.62% |
| Highest Quarterly Return, Date | Jun. 30, 2020 |
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter |
| Lowest Quarterly Return | (18.46%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |