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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
investment
Mar. 31, 2017
investment
Mar. 31, 2016
investment
Jun. 30, 2017
USD ($)
issuer
Jun. 30, 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 3 0 0   0  
Middle Market Loan Program Unfunded Amount $ 147     $ 147   $ 91
Middle market loan commitments $ 600     $ 600    
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%     102.00%    
Allowance for loan losses for commercial mortgage loans and middle market loans $ 6     $ 6   3
Commercial mortgage loan commitments 336     336    
Held-to-maturity Securities, Transferred Security, at Carrying Value 773     773    
Held-to-maturity Securities, Transferred Security, Unrealized Gain (Loss) 47          
Limited partnerships investment commitments 200     200    
Parent Company and Other Business Segments            
Schedule of Investments [Line Items]            
Securities available for sale, fixed maturities, amortized cost 690     690    
Securities available for sale, fixed maturities, fair value 708     708    
Variable Interest Entity, Not Consolidated            
Schedule of Investments [Line Items]            
Securities available for sale, fixed maturities, amortized cost 4,832     4,832   4,729
Securities available for sale, fixed maturities, fair value $ 5,433     $ 5,433   $ 5,261
Number of issuers of VIEs not-consolidated | issuer       147   145