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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2010
Registrant Name dei_EntityRegistrantName Columbia Funds Variable Series Trust II
Central Index Key dei_EntityCentralIndexKey 0001413032
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Sep. 30, 2011
Document Effective Date dei_DocumentEffectiveDate Sep. 30, 2011
Prospectus Date rr_ProspectusDate Apr. 29, 2011
Supplement [Text Block] cfvst1413032_SupplementTextBlock
Prospectus and Statement of Additional Information (SAI) Supplement — September 30, 2011
 
       
Fund (prospectus and SAI effective date)
   Prospectus Form #   SAI Form # 
Variable Portfolio-AllianceBernstein International Value Fund (4/29/11)
   S-6546-99   S-6546-20
       
 
AllianceBernstein L.P. will continue to provide services to the Fund through November 16, 2011.
 
Effective on or about November 16, 2011, the following changes are hereby made to the Fund’s prospectus:
 
The name of the Fund is changed to Variable Portfolio-DFA International Value Fund.
 
Variable Portfolio - AllianceBernstein International Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfvst1413032_SupplementTextBlock The Principal Investment Strategies of the Fund in the Summary section of the prospectus is superseded and replaced as follows:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund’s assets are primarily invested in stocks of large non-U.S. companies that are determined to be “value” stocks at the time of purchase. Securities are considered value stocks primarily because a company’s shares have a high book value in relation to their market value (a “book to market ratio”). In assessing value, additional factors may be considered, such as price to cash flow or price to earnings ratios as well as economic conditions and developments in the issuer’s industry. The criteria used for assessing value are subject to change from time to time. The Fund, using a market capitalization weighted approach, may invest in stocks of large companies located in developed market countries that have been designated as approved markets.

The Fund may invest in equity securities in the form of depositary receipts, which may be listed or traded outside the issuer’s domicile country, to gain exposure to companies associated with approved markets.
Supplement Risk [Text Block] cfvst1413032_SupplementRiskTextBlock The Principal Risks of Investing in the Fund in the Summary section of the prospectus is hereby revised to remove Derivatives Risk — Forward Foreign Currency Contracts and Derivatives Risk — Futures Contracts.
PAST PERFORMANCE cfvst1413032_FundPastPerformanceAbstract  
Supplement Performance [Text Block] cfvst1413032_SupplementPerformanceTextBlock

The Past Performance section in the Summary section is hereby revised to reflect the replacement of the Morgan Stanley Capital International EAFE Index with the Morgan Stanley Capital International World ex-USA Value Index (net dividends). There is no change to the Lipper International Large-Cap Value Funds Index.

The investment manager made this recommendation to the Fund’s Board of Trustees (the Board) because the new index more closely aligns to the Fund’s investment strategy. Information on both indexes will be included for a one-year transition period. In the future, however, only the Morgan Stanley Capital International World ex-USA Value Index (net dividends) will be included.