Columbia Funds Variable Series Trust II N-CSRS 5 Sep 24 Certified semi-annual shareholder report (management investment company) Financial data

Form N-CSR Cover

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

Shareholder Report	6 Months Ended
	Jun. 30, 2024 USD ($) Holdings
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 - Westfield Mid Cap Growth Fund Class 1
Shareholder Report [Line Items]
Fund Name	CTIVP® – Westfield Mid Cap Growth 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 $ 0.82 %
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.82%
Net Assets	$ 294,561,030
Holdings Count | Holdings	59
Investment Company, Portfolio Turnover	33%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund rep rese tag s Top Holdings TransDigm Group, Inc. 3.9% Fair Isaac Corp. 3.4% Ross Stores, Inc. 3.2% Axon Enterprise, Inc. 3.2% Vertiv Holdings Co. 2.9% DexCom, Inc. 2.7% Constellation Brands, Inc., Class A 2.5% Copart, Inc. 2.4% HubSpot, Inc. 2.4% Rockwell Automation, Inc. 2.3% Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings TransDigm Group, Inc. 3.9% Fair Isaac Corp. 3.4% Ross Stores, Inc. 3.2% Axon Enterprise, Inc. 3.2% Vertiv Holdings Co. 2.9% DexCom, Inc. 2.7% Constellation Brands, Inc., Class A 2.5% Copart, Inc. 2.4% HubSpot, Inc. 2.4% Rockwell Automation, Inc. 2.3%
CTIVP - Westfield Mid Cap Growth Fund Class 2
Shareholder Report [Line Items]
Fund Name	CTIVP® – Westfield Mid Cap Growth 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 $ 1.07 %
Expenses Paid, Amount	$ 54
Expense Ratio, Percent	1.07%
Net Assets	$ 294,561,030
Holdings Count | Holdings	59
Investment Company, Portfolio Turnover	33%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the rep ort $
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a p Top Holdings TransDigm Group, Inc. 3.9% Fair Isaac Corp. 3.4% Ross Stores, Inc. 3.2% Axon Enterprise, Inc. 3.2% Vertiv Holdings Co. 2.9% DexCom, Inc. 2.7% Constellation Brands, Inc., Class A 2.5% Copart, Inc. 2.4% HubSpot, Inc. 2.4% Rockwell Automation, Inc. 2.3% Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings TransDigm Group, Inc. 3.9% Fair Isaac Corp. 3.4% Ross Stores, Inc. 3.2% Axon Enterprise, Inc. 3.2% Vertiv Holdings Co. 2.9% DexCom, Inc. 2.7% Constellation Brands, Inc., Class A 2.5% Copart, Inc. 2.4% HubSpot, Inc. 2.4% Rockwell Automation, Inc. 2.3%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Jun. 30, 2024
CTIVP - Westfield Mid Cap Growth Fund Class 2 | TransDigm Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.90%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Fair Isaac Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.40%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Ross Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Axon Enterprise, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Vertiv Holdings Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | DexCom, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Constellation Brands, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Copart, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | HubSpot, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Rockwell Automation, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.40%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.80%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.50%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.30%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.20%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.40%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.90%
CTIVP - Westfield Mid Cap Growth Fund Class 2 | Money Market Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | TransDigm Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.90%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Fair Isaac Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.40%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Ross Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Axon Enterprise, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Vertiv Holdings Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | DexCom, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Constellation Brands, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Copart, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | HubSpot, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Rockwell Automation, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	27.40%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.80%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.50%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.30%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.20%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.40%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.90%
CTIVP - Westfield Mid Cap Growth Fund Class 1 | Money Market Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.50%