Charges and Expenses (Details) - 6 months ended Jun. 30, 2015 - USD ($)	Total
VAL
Charges And Expenses [Line Items]
Effective annual rate used to determine daily the mortality risk and expense risk charges	0.60%
Maximum percent of sales charges	5.00%
Partial withdrawal charge, amount	$ 15
Partial withdrawal charge, percent	2.00%
VLI
Charges And Expenses [Line Items]
Effective annual rate used to determine daily the mortality risk and expense risk charges	0.35%
SPVA
Charges And Expenses [Line Items]
Effective annual rate used to determine daily the mortality risk and expense risk charges	0.90%
Effective annual rate used to determine daily the administrative charges	0.35%
SPVL
Charges And Expenses [Line Items]
Effective annual rate used to determine daily the mortality risk and expense risk charges	0.90%
Effective annual rate used to determine daily the administrative charges	0.35%