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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 Conservative Growth Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name Variable Portfolio – U.S. Flexible Conservative 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 Conservative 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
$
15		0.30
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.30% [1]
Net Assets $ 320,076,144
Holdings Count | Holding 41
Investment Company, Portfolio Turnover 100.00%
Additional Fund Statistics [Text Block]
Key Fund Stati
s
tics
Fund net assets
$
320,076,144
Total number of portfolio holdings
41
Portfolio turnover for the reporting period
100%
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 Risk3.1
%
Interest Rate Risk6.9
%
Short
Equity Risk19.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Variable Portfolio – U.S. Flexible Conservative Growth Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name Variable Portfolio – U.S. Flexible Conservative Growth Fund
Class Name Class 2
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] T
his semi-annual shareholder report contains important information about Variable Portfolio – U.S. Flexible Conservative 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 2
$
28		0.55
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.55% [1]
Net Assets $ 320,076,144
Holdings Count | Holding 41
Investment Company, Portfolio Turnover 100.00%
Additional Fund Statistics [Text Block]
Key Fund Sta
ti
stics
Fund net assets
$
320,076,144
Total number of portfolio holdings
41
Portfolio turnover for the reporting period
100%
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 Risk3.1
%
Interest Rate Risk6.9
%
Short
Equity Risk19.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
[1] Annualized.