SIGNIFICANT ACCOUNTING POLICIES - DAC AND VOBA (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
DAC [Abstract]      
VOBA Amortization Period Maximum (in years) 50 years    
Mean (RTM) assumption (as a percent)   7.00% 9.00%
Average gross short-term and long-term annual return estimate (as a percent) 7.00%    
Average net short-term and long-term annual return estimate (as a percent) 5.60%    
Gross maximum short-term annual rate of return limitations (as a percent) 15.00%    
Net maximum short-term annual rate of return limitations (as a percent) 13.60%    
Gross minimum short-term annual rate of return limitations (as a percent) 0.00%    
Net minimum short-term annual rate of return limitations (as a percent) (1.40%)    
Term of rate limitations (in years) 5 years