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Shareholder Report
 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSR
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 Dec. 31, 2024
Class I  
Shareholder Report [Line Items]  
Fund Name Western Asset Variable Global High Yield Bond Portfolio
Class Name Class I
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Variable Global High Yield Bond Portfolio for the period January 1, 2024, to December 31, 2024.
Shareholder Report Annual or Semi-Annual 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.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
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 YEAR? (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 I1
$84
0.81%
[1],[2]
Expenses Paid, Amount $ 84 [1]
Expense Ratio, Percent 0.81% [1]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended December 31, 2024, Class I shares of Western Asset Variable Global High Yield Bond Portfolio returned 7.06%. The Fund compares its performance to the Bloomberg Global High Yield Index (Hedged) (USD), which returned 10.71% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Issue selection within multiple sectors, including sovereigns, transportation, insurance and energy.
↑
Allocation to collateralized loan obligations.
↑
Underweight to BB and B rated securities.
Top detractors from performance:
↓
Issue selection within multiple sectors, including communications, consumer cyclicals, consumer noncyclicals and capital goods.
↓
Underweight to lower quality as CCC rated securities outperformed.
↓
Currency positioning.
Use of derivatives and the impact on performance:
The Fund utilized forward foreign currency contracts and futures contracts to manage currency risk. In aggregate, these derivatives contributed to performance.
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.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended December 31, 2024
 
1 Year
5 Year
10 Year
Class I
7.06
2.06
3.71
Bloomberg Global Aggregate Index
-1.69
-1.96
0.15
Bloomberg Global High Yield Index (Hedged)(USD)
10.71
3.94
5.23
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date Mar. 01, 2024
Updated Performance Information Location [Text Block]
Important data provider notices and terms available at   www.franklintempletondatasources.com.
Net Assets $ 153,474,283
Holdings Count | $ / shares 332 [3]
Advisory Fees Paid, Amount $ 1,040,246
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2024)
Total Net Assets
$153,474,283
Total Number of Portfolio Holdings*
332
Total Management Fee Paid
$1,040,246
Portfolio Turnover Rate
51%
[3]
Holdings [Text Block]
image
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
Effective March 1, 2024, the Fund’s named portfolio management team consists of Michael C. Buchanan, Ryan Kohan, Ian R. Edmonds, Walter E. Kilcullen, Christopher F. Kilpatrick and Mark Hughes.
This is a summary of certain changes to the Fund since January 1, 2024. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by May 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or       
prospectus@franklintempleton.com.
Updated Prospectus Phone Number 877-6LM-FUND/656-3863
Updated Prospectus Email Address prospectus@franklintempleton.com
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class II  
Shareholder Report [Line Items]  
Fund Name Western Asset Variable Global High Yield Bond Portfolio
Class Name Class II
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Western Asset Variable Global High Yield Bond Portfolio for the period January 1, 2024, to December 31, 2024.
Shareholder Report Annual or Semi-Annual 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.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
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 YEAR? (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 II1
$110
1.06%
[4],[5]
Expenses Paid, Amount $ 110 [4]
Expense Ratio, Percent 1.06% [4]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
For the twelve months ended December 31, 2024, Class II shares of Western Asset Variable Global High Yield Bond Portfolio returned 6.70%. The Fund compares its performance to the Bloomberg Global High Yield Index (Hedged) (USD), which returned 10.71% for the same period.
PERFORMANCE HIGHLIGHTS
Top contributors to performance:
↑
Issue selection within multiple sectors, including sovereigns, transportation, insurance and energy.
↑
Allocation to collateralized loan obligations.
↑
Underweight to BB and B rated securities.
Top detractors from performance:
↓
Issue selection within multiple sectors, including communications, consumer cyclicals, consumer noncyclicals and capital goods.
↓
Underweight to lower quality as CCC rated securities outperformed.
↓
Currency positioning.
Use of derivatives and the impact on performance:
The Fund utilized forward foreign currency contracts and futures contracts to manage currency risk. In aggregate, these derivatives contributed to performance.
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.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended December 31, 2024
 
1 Year
5 Year
10 Year
Class II
6.70
1.81
3.45
Bloomberg Global Aggregate Index
-1.69
-1.96
0.15
Bloomberg Global High Yield Index (Hedged)(USD)
10.71
3.94
5.23
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Material Change Date Mar. 01, 2024
Updated Performance Information Location [Text Block]
Important data provider notices and terms available at   www.franklintempletondatasources.com.
Net Assets $ 153,474,283
Holdings Count | $ / shares 332 [6]
Advisory Fees Paid, Amount $ 1,040,246
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2024)
Total Net Assets
$153,474,283
Total Number of Portfolio Holdings*
332
Total Management Fee Paid
$1,040,246
Portfolio Turnover Rate
51%
[6]
Holdings [Text Block]
image
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
Effective March 1, 2024, the Fund’s named portfolio management team consists of Michael C. Buchanan, Ryan Kohan, Ian R. Edmonds, Walter E. Kilcullen, Christopher F. Kilpatrick and Mark Hughes.
This is a summary of certain changes to the Fund since January 1, 2024. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by May 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at 877-6LM-FUND/656-3863 or       
prospectus@franklintempleton.com.
Updated Prospectus Phone Number 877-6LM-FUND/656-3863
Updated Prospectus Email Address prospectus@franklintempleton.com
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.
[2]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[3]
* Does not include derivatives, except purchased options, if any.
[4]
1 Does not reflect expenses incurred from investing through variable annuity or variable life insurance products.
[5]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[6]
* Does not include derivatives, except purchased options, if any.