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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
investment
issuer
Mar. 31, 2016
investment
Dec. 31, 2016
USD ($)
issuer
Schedule of Investments [Line Items]      
Held to maturity securities transferred to available for sale securities, number of investments | investment 0 0  
Middle Market Loan Program Unfunded Amount $ 135   $ 91
Middle market loan commitment $ 658    
Percentage that the lending policy requires that the fair value of the securities and/or unrestricted cash received as collateral be of the fair value of the loaned securities 102.00%    
Allowance for loan losses for commercial mortgage loans and middle market loans $ 4   3
Commercial mortgage loan commitments 18    
Parent Company and Other Business Segments      
Schedule of Investments [Line Items]      
Securities available for sale, fixed maturities, amortized cost 630    
Securities available for sale, fixed maturities, fair value 642    
Variable Interest Entity, Not Consolidated      
Schedule of Investments [Line Items]      
Securities available for sale, fixed maturities, amortized cost 4,823   4,729
Securities available for sale, fixed maturities, fair value $ 5,354   $ 5,261
Number of issuers of VIEs not-consolidated | issuer 149   145