v3.25.1
Expense Example
Dec. 31, 2024
USD ($)
NVIT Fidelity Institutional AM Emerging Markets Fund | Class Y Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 99
Expense Example, with Redemption, 3 Years 339
Expense Example, with Redemption, 5 Years 598
Expense Example, with Redemption, 10 Years 1,339
NVIT Fidelity Institutional AM Emerging Markets Fund | Class D Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 145
Expense Example, with Redemption, 3 Years 479
Expense Example, with Redemption, 5 Years 837
Expense Example, with Redemption, 10 Years 1,845
NVIT Fidelity Institutional AM Emerging Markets Fund | Class I Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 114
Expense Example, with Redemption, 3 Years 386
Expense Example, with Redemption, 5 Years 678
Expense Example, with Redemption, 10 Years 1,510
NVIT Fidelity Institutional AM Emerging Markets Fund | Class II Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 139
Expense Example, with Redemption, 3 Years 463
Expense Example, with Redemption, 5 Years 810
Expense Example, with Redemption, 10 Years 1,790
NVIT Putnam International Value Fund | Class Y Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 82
Expense Example, with Redemption, 3 Years 264
Expense Example, with Redemption, 5 Years 462
Expense Example, with Redemption, 10 Years 1,033
NVIT Putnam International Value Fund | Class Z Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 108
Expense Example, with Redemption, 3 Years 346
Expense Example, with Redemption, 5 Years 602
Expense Example, with Redemption, 10 Years 1,337
NVIT Putnam International Value Fund | Class X Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 83
Expense Example, with Redemption, 3 Years 267
Expense Example, with Redemption, 5 Years 467
Expense Example, with Redemption, 10 Years 1,045
NVIT Putnam International Value Fund | Class I Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 97
Expense Example, with Redemption, 3 Years 311
Expense Example, with Redemption, 5 Years 543
Expense Example, with Redemption, 10 Years 1,209
NVIT Putnam International Value Fund | Class II Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 122
Expense Example, with Redemption, 3 Years 389
Expense Example, with Redemption, 5 Years 677
Expense Example, with Redemption, 10 Years $ 1,496