| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| 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, 2024 |
| Shareholder Report | 6 Months Ended |
| Jun. 30, 2024 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, 2024 |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | |
| Shareholder Report [Line Items] | |
| Fund Name | CTIVP® – BlackRock Global Inflation-Protected Securities Fund |
| Class Name | Class 1 |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report ® |
| 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 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 1 $ 0.60 % |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.60% |
| Net Assets | $ 76,393,622 |
| Holdings Count | Holding | 270 |
| Investment Company, Portfolio Turnover | 57% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 270 Portfolio turnover for the reporting period 57% |
| Holdings [Text Block] | Graphical Representation of Fund 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 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, 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, S&P and 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. The Fund may use place of organization/incorporation or other factors in determining whether an i ssu ore Derivative Exposure Long Foreign Exchange Risk 47.8% Interest Rate Risk 128.9% Short Foreign Exchange Risk 94.8% Interest Rate Risk 29.2% Credit Quality Geographic Allocation |
| 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, 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, S&P and 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. Credit Quality |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | |
| Shareholder Report [Line Items] | |
| Fund Name | CTIVP® – BlackRock Global Inflation-Protected Securities Fund |
| Class Name | Class 2 |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report ® |
| 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 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 2 $ 0.85 % |
| Expenses Paid, Amount | $ 42 |
| Expense Ratio, Percent | 0.85% |
| Net Assets | $ 76,393,622 |
| Holdings Count | Holding | 270 |
| Investment Company, Portfolio Turnover | 57% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 270 Portfolio turnover for the reporting period 57% |
| Holdings [Text Block] | Graphical Representation of Fund 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, 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, S&P and 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 The Fund may use place of organization/incorporation or other factors in determining whether an issuer is domestic (U.S.) or foreign for purposes of its investment policies. At June 30, 2024 the Fund invested at least 40% of its net assets in fore ign Derivative Exposure Long Foreign Exchange Risk 47.8 % Interest Rate Risk 128.9 % Short Foreign Exchange Risk 94.8 % Interest Rate Risk 29.2 % Credit Quality Geographic Allocation |
| 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, 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, S&P and 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 Credit Quality |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | |
| Shareholder Report [Line Items] | |
| Fund Name | CTIVP® – BlackRock Global Inflation-Protected Securities Fund |
| Class Name | Class 3 |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report ® |
| 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 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 3 $ 0.73 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.73% |
| Net Assets | $ 76,393,622 |
| Holdings Count | Holding | 270 |
| Investment Company, Portfolio Turnover | 57% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 270 Portfolio turnover for the reporting period 57% |
| Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the 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, 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, S&P and 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. The Fund may use place of organization/incorporation or other factors in determining whether an issuer is domestic (U.S.) or foreign for purposes of its investment policies. At June 30, 2024 the Fund invested at least 40% of its net assets in foreign companies in acc Derivative Exposure Long Foreign Exchange Risk 47.8 % Interest Rate Risk 128.9 % Short Foreign Exchange Risk 94.8 % Interest Rate Risk 29.2 % Credit Quality Geographic Allocation |
| 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, 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, S&P and 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. Credit Quality |
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.40% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.80% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | FRANCE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | ITALY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | GERMANY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | SPAIN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | JAPAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | CANADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | AUSTRALIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | Long Foreign Exchange Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.80% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | Short Foreign Exchange Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.80% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | Long Interest Rate Risks [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 128.90% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund Class 3 | Short Interest Rate Risks [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.40% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.80% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | FRANCE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | ITALY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | GERMANY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | SPAIN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | JAPAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | CANADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | AUSTRALIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | Long Foreign Exchange Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.80% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | Short Foreign Exchange Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.80% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | Long Interest Rate Risks [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 128.90% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 2) | Short Interest Rate Risks [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 87.40% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | UNITED STATES | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | UNITED KINGDOM | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.80% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | FRANCE | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | ITALY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | GERMANY | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | SPAIN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | JAPAN | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | CANADA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | AUSTRALIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | Long Foreign Exchange Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.80% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | Short Foreign Exchange Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.80% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | Long Interest Rate Risks [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 128.90% |
| CTIVP® – BlackRock Global Inflation-Protected Securities Fund (Class 1) | Short Interest Rate Risks [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.20% |
