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Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Columbia Funds Variable Insurance Trust
Entity Central Index Key 0000815425
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
Variable Portfolio – U.S. Flexible Moderate Growth Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name Variable Portfolio – U.S. Flexible Moderate Growth Fund
Class Name Class 1
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Variable Portfolio – U.S. Flexible Moderate Growth Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class 1
$
14		0.27
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 14
Expense Ratio, Percent 0.27% [1]
Net Assets $ 2,067,118,308
Holdings Count | Holding 42
Investment Company, Portfolio Turnover 109.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
2,067,118,308
Total number of portfolio holdings
42
Portfolio turnover for the reporting period
109%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Derivative Exposure
Long
Equity Risk6.4
%
Interest Rate Risk7.6
%
Short
Equity Risk25.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Variable Portfolio – U.S. Flexible Moderate Growth Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name Variable Portfolio – U.S. Flexible Moderate Growth Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Variable Portfolio – U.S. Flexible Moderate Growth Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment
Class 2
$
26		 0.52
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.52% [1]
Net Assets $ 2,067,118,308
Holdings Count | Holding 42
Investment Company, Portfolio Turnover 109.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
2,067,118,308
Total number of portfolio holdings
 42
Portfolio turnover for the reporting period
 109%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Derivative Exposure
Long
Equity Risk 6.4
%
Interest Rate Risk 7.6
%
Short
Equity Risk 25.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
[1] Annualized.