v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
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, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Class I  
Shareholder Report [Line Items]  
Fund Name Western Asset Variable Global High Yield Bond Portfolio
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 Variable Global High Yield Bond Portfolio for the period  January 1, 2026, to June 30, 2026.
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 I1
$41
0.81%
[1],[2],[3]
Expenses Paid, Amount $ 41 [1]
Expense Ratio, Percent 0.81% [1]
Net Assets $ 158,610,194
Holdings Count | $ / shares 391
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of June 30, 2026)
Total Net Assets
$158,610,194
Total Number of Portfolio Holdings (excludes derivatives, except purchased options, if any)
391
Portfolio Turnover Rate
31%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Portfolio Composition*  (% of Total Investments)
image
 [4]
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 true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Western Asset Variable Global High Yield Bond Portfolio for the period  January 1, 2026, to June 30, 2026.
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 II1
$53
1.06%
[5],[6],[7]
Expenses Paid, Amount $ 53 [5]
Expense Ratio, Percent 1.06% [5]
Net Assets $ 158,610,194
Holdings Count | $ / shares 391
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of June 30, 2026)
Total Net Assets
$158,610,194
Total Number of Portfolio Holdings (excludes derivatives, except purchased options, if any)
391
Portfolio Turnover Rate
31%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Portfolio Composition*  (% of Total Investments)
image
 [8]
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]
† Annualized.
[4]
* Does not include derivatives, except purchased options, if any.  
[5]
1 Does not reflect expenses incurred from investing through variable annuity or variable life insurance products.
[6]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[7]
† Annualized.
[8]
* Does not include derivatives, except purchased options, if any.