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 ($) 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® – Westfield Select Large Cap Growth Fund Class 2
Shareholder Report [Line Items]
Fund Name	CTIVP® – Westfield Select Large 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 $50 0.95%
Expenses Paid, Amount	$ 50
Expense Ratio, Percent	0.95%
Net Assets	$ 1,794,235,235
Holdings Count | Holding	31
Investment Company, Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $1,794,235,235 Total number of portfolio holdings 31 Portfolio turnover for the reporting period 45%
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. Top Holdings NVIDIA Corp. 9.6% Microsoft Corp. 8.8% Apple, Inc. 7.2% Amazon.com, Inc. 5.0% Meta Platforms, Inc., Class A 5.0% Alphabet, Inc., Class A 4.9% Ascendis Pharma A/S ADR 4.7% TransDigm Group, Inc. 4.5% Vertiv Holdings Co. 3.6% ServiceNow, Inc. 3.2% Equity Sector Allocation Information Technology Sub-industry Allocation
Largest Holdings [Text Block]	Top Holdings NVIDIA Corp. 9.6% Microsoft Corp. 8.8% Apple, Inc. 7.2% Amazon.com, Inc. 5.0% Meta Platforms, Inc., Class A 5.0% Alphabet, Inc., Class A 4.9% Ascendis Pharma A/S ADR 4.7% TransDigm Group, Inc. 4.5% Vertiv Holdings Co. 3.6% ServiceNow, Inc. 3.2%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1
Shareholder Report [Line Items]
Fund Name	CTIVP® – Westfield Select Large 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 $37 0.70%
Expenses Paid, Amount	$ 37
Expense Ratio, Percent	0.70%
Net Assets	$ 1,794,235,235
Holdings Count | Holding	31
Investment Company, Portfolio Turnover	45%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $1,794,235,235 Total number of portfolio holdings 31 Portfolio turnover for the reporting period 45%
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. Top Holdings NVIDIA Corp. 9.6% Microsoft Corp. 8.8% Apple, Inc. 7.2% Amazon.com, Inc. 5.0% Meta Platforms, Inc., Class A 5.0% Alphabet, Inc., Class A 4.9% Ascendis Pharma A/S ADR 4.7% TransDigm Group, Inc. 4.5% Vertiv Holdings Co. 3.6% ServiceNow, Inc. 3.2% Equity Sector Allocation Information Technology Sub-industry Allocation
Largest Holdings [Text Block]	Top Holdings NVIDIA Corp. 9.6% Microsoft Corp. 8.8% Apple, Inc. 7.2% Amazon.com, Inc. 5.0% Meta Platforms, Inc., Class A 5.0% Alphabet, Inc., Class A 4.9% Ascendis Pharma A/S ADR 4.7% TransDigm Group, Inc. 4.5% Vertiv Holdings Co. 3.6% ServiceNow, Inc. 3.2%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Jun. 30, 2024
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | NVIDIA Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Microsoft Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Apple, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Amazon.com, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Meta Platforms, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Alphabet, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Ascendis Pharma A/S ADR [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | TransDigm Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Vertiv Holdings Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | ServiceNow, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.80%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.50%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.90%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.50%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Semiconductors [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.20%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Systems Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Technology Hardware, Storage and Peripherals [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.10%
CTIVP® – Westfield Select Large Cap Growth Fund Class 2 | Application Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.50%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | NVIDIA Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Microsoft Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.80%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Apple, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Amazon.com, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Meta Platforms, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Alphabet, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Ascendis Pharma A/S ADR [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | TransDigm Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Vertiv Holdings Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | ServiceNow, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	41.80%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	15.50%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.90%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.50%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Semiconductors [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.20%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Systems Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Technology Hardware, Storage and Peripherals [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.10%
CTIVP® – Westfield Select Large Cap Growth Fund Class 1 | Application Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.50%