| 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 Income Trust |
| Entity Central Index Key | 0000874835 |
| 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 Income Trust | |
| Entity Central Index Key | 0000874835 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Jun. 30, 2024 | |
| Class I | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Western Asset Long Credit VIT | |
| Class Name | Class I | |
| No Trading Symbol | true | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Western Asset Long Credit VIT 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 $22 0.45% | [1],[2],[3] |
| Expenses Paid, Amount | $ 22 | [1] |
| Expense Ratio, Percent | 0.45% | [1] |
| Net Assets | $ 214,673,544 | |
| Holdings Count | $ / shares | 822 | [4] |
| Investment Company Portfolio Turnover | 35% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of June 30, 2024) Total Net Assets $214,673,544 Total Number of Portfolio Holdings * 822 Portfolio Turnover Rate 35% | [4] |
| 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. | ||
| Shareholder Report, Holdings (Details) - Class I | Jun. 30, 2024 |
| Financials_[Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.90% |
| Energy [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.80% |
| Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.10% |
| Utilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7% |
| Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.80% |
| Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| Sovereign Bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| Materials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| Asset-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.20% |
| U.S. Government & Agency Obligation [Members] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| Municipal Bonds [Members] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| Collateralized Mortgage Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| Real Estate [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| Mortgage-Backed Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| Short-Term Investment [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
