v3.25.2
N-6
Jun. 30, 2025
Prospectus:  
Document Type N-6
Entity Registrant Name CORPORATE SPONSORED VUL SEPARATE ACCOUNT I
Entity Central Index Key 0001018042
Entity Investment Company Type N-6
Document Period End Date Jun. 30, 2025
Amendment Flag false
CorpExec VUL Plus | FidelityVIPGovernmentMoneyMarketPortfolioInitialClassMember  
Prospectus:  
Portfolio Company Name [Text Block] Fidelity® VIP Government Money Market Portfolio—Initial Class
NYLIAC Corporate Sponsored Variable Universal Life | FidelityVIPGovernmentMoneyMarketPortfolioInitialClassMember  
Prospectus:  
Portfolio Company Name [Text Block] Fidelity® VIP Government Money Market Portfolio—Initial Class
Corporate Executive Accumulator Variable Universal Life | FidelityVIPGovernmentMoneyMarketPortfolioInitialClassMember  
Prospectus:  
Portfolio Company Name [Text Block] Fidelity® VIP Government Money Market Portfolio—Initial Class
CorpExec VUL: Corporate Executive Series Variable Universal Life | FidelityVIPGovernmentMoneyMarketPortfolioInitialClassMember  
Prospectus:  
Portfolio Company Name [Text Block] Fidelity® VIP Government Money Market Portfolio—Initial Class