| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Legg Mason Partners Variable Equity Trust |
| Entity Central Index Key | 0001176343 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Jun. 30, 2024 USD ($) $ / shares | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | Legg Mason Partners Variable Equity Trust | |
| Entity Central Index Key | 0001176343 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Jun. 30, 2024 | |
| Class I | ||
| Shareholder Report [Line Items] | ||
| Fund Name | ClearBridge Variable Large Cap Growth Portfolio | |
| Class Name | Class I | |
| No Trading Symbol Flag | true | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about ClearBridge Variable Large Cap Growth Portfolio for the period January 1, 2024, to June 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at 877-6LM-FUND/656-3863 . | |
| Additional Information Phone Number | 877-6LM-FUND/656-3863 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * , † Class I 1 $40 0.74% | [1],[2],[3] |
| Expenses Paid, Amount | $ 40 | [1] |
| Expense Ratio, Percent | 0.74% | [1] |
| Net Assets | $ 526,553,762 | |
| Holdings Count | $ / shares | 43 | [4] |
| Investment Company Portfolio Turnover | 7% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of June 30, 2024) Total Net Assets $526,553,762 Total Number of Portfolio Holdings * 43 Portfolio Turnover Rate 7% | [4] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class II | ||
| Shareholder Report [Line Items] | ||
| Fund Name | ClearBridge Variable Large Cap Growth Portfolio | |
| Class Name | Class II | |
| No Trading Symbol Flag | true | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about ClearBridge Variable Large Cap Growth Portfolio for the period January 1, 2024, to June 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at 877-6LM-FUND/656-3863 . | |
| Additional Information Phone Number | 877-6LM-FUND/656-3863 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * , † Class II 1 $54 0.99% | [5],[6],[7] |
| Expenses Paid, Amount | $ 54 | [5] |
| Expense Ratio, Percent | 0.99% | [5] |
| Net Assets | $ 526,553,762 | |
| Holdings Count | $ / shares | 43 | [8] |
| Investment Company Portfolio Turnover | 7% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of June 30, 2024) Total Net Assets $526,553,762 Total Number of Portfolio Holdings * 43 Portfolio Turnover Rate 7% | [8] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| [1] 1 Does not reflect expenses incurred from investing through variable annuity or variable life insurance products. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. 1 Does not reflect expenses incurred from investing through variable annuity or variable life insurance products. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. | ||
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 |
| Class I | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 38.20% |
| Class I | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| Class I | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.40% |
| Class I | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| Class I | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| Class I | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| Class I | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| Class I | Real Estate [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| Class I | Materials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| Class I | Utilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| Class I | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| Class II | Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 38.20% |
| Class II | Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| Class II | Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.40% |
| Class II | Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| Class II | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| Class II | Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9% |
| Class II | Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| Class II | Real Estate [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.70% |
| Class II | Materials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| Class II | Utilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| Class II | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
