v3.25.2
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 Series Trust II
Entity Central Index Key 0001413032
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
Columbia Variable Portfolio – U.S. Government Mortgage Fund - Class 1  
Shareholder Report [Line Items]  
Fund Name Columbia Variable Portfolio – U.S. Government Mortgage 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 Columbia Variable Portfolio – U.S. Government Mortgage 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
$
22		0.44
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.44% [1]
Net Assets $ 1,372,706,857
Holdings Count | Holding 348
Investment Company, Portfolio Turnover 191.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,372,706,857
Total number of portfolio holdings
348
Portfolio turnover for the reporting period
191%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
11%
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.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top Holdings
Uniform Mortgage-Backed Security TBA
07/14/2055 3.500%		8.1
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.000%		6.5
%
Government National Mortgage Association TBA
07/21/2055 4.500%		5.2
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.000%		3.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.500%		3.2
%
Government National Mortgage Association TBA
07/21/2055 4.000%		2.7
%
Uniform Mortgage-Backed Security TBA
07/14/2055 2.500%		2.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.500%		2.0
%
Uniform Mortgage-Backed Security TBA
07/14/2055 3.000%		1.7
%
Federal National Mortgage Association
03/25/2028 3.127%		1.6
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
07/14/2055 3.500%		8.1
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.000%		6.5
%
Government National Mortgage Association TBA
07/21/2055 4.500%		5.2
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.000%		3.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.500%		3.2
%
Government National Mortgage Association TBA
07/21/2055 4.000%		2.7
%
Uniform Mortgage-Backed Security TBA
07/14/2055 2.500%		2.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.500%		2.0
%
Uniform Mortgage-Backed Security TBA
07/14/2055 3.000%		1.7
%
Federal National Mortgage Association
03/25/2028 3.127%		1.6
%
Columbia Variable Portfolio – U.S. Government Mortgage Fund - Class 2  
Shareholder Report [Line Items]  
Fund Name Columbia Variable Portfolio – U.S. Government Mortgage 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 Columbia Variable Portfolio – U.S. Government Mortgage 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
$
35		0.69
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.69% [1]
Net Assets $ 1,372,706,857
Holdings Count | Holding 348
Investment Company, Portfolio Turnover 191.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,372,706,857
Total number of portfolio holdings
348
Portfolio turnover for the reporting period
191%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
11%
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.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top Holdings
Uniform Mortgage-Backed Security TBA
07/14/2055 3.500%		8.1
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.000%		6.5
%
Government National Mortgage Association TBA
07/21/2055 4.500%		5.2
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.000%		3.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.500%		3.2
%
Government National Mortgage Association TBA
07/21/2055 4.000%		2.7
%
Uniform Mortgage-Backed Security TBA
07/14/2055 2.500%		2.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.500%		2.0
%
Uniform Mortgage-Backed Security TBA
07/14/2055 3.000%		1.7
%
Federal National Mortgage Association
03/25/2028 3.127%		1.6
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
07/14/2055 3.500%		8.1
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.000%		6.5
%
Government National Mortgage Association TBA
07/21/2055 4.500%		5.2
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.000%		3.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.500%		3.2
%
Government National Mortgage Association TBA
07/21/2055 4.000%		2.7
%
Uniform Mortgage-Backed Security TBA
07/14/2055 2.500%		2.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.500%		2.0
%
Uniform Mortgage-Backed Security TBA
07/14/2055 3.000%		1.7
%
Federal National Mortgage Association
03/25/2028 3.127%		1.6
%
Columbia Variable Portfolio – U.S. Government Mortgage Fund - Class 3  
Shareholder Report [Line Items]  
Fund Name Columbia Variable Portfolio – U.S. Government Mortgage Fund
Class Name Class 3
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Variable Portfolio – U.S. Government Mortgage 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 3
$
29		0.57
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.57% [1]
Net Assets $ 1,372,706,857
Holdings Count | Holding 348
Investment Company, Portfolio Turnover 191.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,372,706,857
Total number of portfolio holdings
348
Portfolio turnover for the reporting period
191%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
11%
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.
Bond ratings on Fund holdings are divided into categories ranging from highest to low
est credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available
ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the
s
ame methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top Holdings
Uniform Mortgage-Backed Security TBA
07/14/2055 3.500%		8.1
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.000%		6.5
%
Government National Mortgage Association TBA
07/21/2055 4.500%		5.2
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.000%		3.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.500%		3.2
%
Government National Mortgage Association TBA
07/21/2055 4.000%		2.7
%
Uniform Mortgage-Backed Security TBA
07/14/2055 2.500%		2.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.500%		2.0
%
Uniform Mortgage-Backed Security TBA
07/14/2055 3.000%		1.7
%
Federal National Mortgage Association
03/25/2028 3.127%		1.6
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to low
est credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available
ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the
s
ame methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
07/14/2055 3.500%		8.1
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.000%		6.5
%
Government National Mortgage Association TBA
07/21/2055 4.500%		5.2
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.000%		3.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 4.500%		3.2
%
Government National Mortgage Association TBA
07/21/2055 4.000%		2.7
%
Uniform Mortgage-Backed Security TBA
07/14/2055 2.500%		2.4
%
Uniform Mortgage-Backed Security TBA
07/14/2055 5.500%		2.0
%
Uniform Mortgage-Backed Security TBA
07/14/2055 3.000%		1.7
%
Federal National Mortgage Association
03/25/2028 3.127%		1.6
%
[1] Annualized.