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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
investment
Jun. 30, 2015
investment
Jun. 30, 2016
USD ($)
issuer
investment
Jun. 30, 2015
investment
Dec. 31, 2015
USD ($)
Schedule of Investments [Line Items]          
Amortized Cost $ 73,160   $ 73,160   $ 62,963
Held to maturity securities transferred to available for sale securities, number of investments | investment 0 0 0 0  
Middle Market Loan Receivable $ 227   $ 227   118
Middle Market Loan Program Unfunded Amount 31   31   53
Middle market loan commitment $ 72   $ 72    
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%    
Commercial mortgage loan commitments $ 177   $ 177    
Parent Company and Other Business Segments          
Schedule of Investments [Line Items]          
Securities available for sale, fixed maturities, amortized cost 570   570    
Securities available for sale, fixed maturities, fair value 598   598    
Variable Interest Entity, Consolidated          
Schedule of Investments [Line Items]          
Available-for-sale securities, equity securities 941   941   363
Securities available for sale, fixed maturities, amortized cost 4,878   4,878   3,739
Securities available for sale, fixed maturities, fair value 5,493   5,493   4,554
Available-for-sale equity securities, amortized cost basis 1,018   1,018   363
Variable Interest Entity, Not Consolidated          
Schedule of Investments [Line Items]          
Securities available for sale, fixed maturities, amortized cost 5,158   5,158   4,731
Securities available for sale, fixed maturities, fair value 5,656   $ 5,656   5,093
Number of issuers of VIEs not-consolidated | issuer     143    
Bank loans          
Schedule of Investments [Line Items]          
Securities available for sale, fixed maturities, amortized cost 2,100   $ 2,100   1,400
Securities available for sale, fixed maturities, fair value 1,900   1,900   $ 1,400
Commercial mortgage loans          
Schedule of Investments [Line Items]          
Other investments held in unit trust, net of reserves, amortized cost 165   165    
Other investments, net of reserves, amortized cost $ 188   $ 188