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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
issuer
investment
Sep. 30, 2015
USD ($)
investment
Dec. 31, 2015
USD ($)
Schedule of Investments [Line Items]          
Amortized Cost $ 74,148   $ 74,148   $ 62,963
Held to maturity securities transferred to available for sale securities, number of investments | investment     0 0  
Middle Market Loan Receivable 240   $ 240   118
Middle Market Loan Program Unfunded Amount 23   23   53
Middle market loan commitment $ 409   $ 409    
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 $ 185   $ 185    
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net [1] 22 $ 137 69 $ 143  
Parent Company and Other Business Segments          
Schedule of Investments [Line Items]          
Securities available for sale, fixed maturities, amortized cost 601   601    
Securities available for sale, fixed maturities, fair value 629   629    
Variable Interest Entity, Consolidated          
Schedule of Investments [Line Items]          
Available-for-sale securities, equity securities 1,014   1,014   363
Securities available for sale, fixed maturities, amortized cost 4,870   4,870   3,739
Securities available for sale, fixed maturities, fair value 5,494   5,494   4,554
Available-for-sale equity securities, amortized cost basis 1,036   1,036   363
Variable Interest Entity, Not Consolidated          
Schedule of Investments [Line Items]          
Securities available for sale, fixed maturities, amortized cost 5,241   5,241   4,731
Securities available for sale, fixed maturities, fair value 5,814   $ 5,814   5,093
Number of issuers of VIEs not-consolidated | issuer     146    
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 481   481    
Other investments, net of reserves, amortized cost 555   555    
Middle market loans          
Schedule of Investments [Line Items]          
Other investments held in unit trust, net of reserves, amortized cost $ 8   $ 8    
[1] Includes $22 and $6 for the three-month periods and $69 and $12 for the nine-month periods ended September 30, 2016 and 2015, respectively, from change in intent to sell securities or change in intent to hold securities until recovery; and $131 for the three- and nine-month periods ended September 30, 2015, for credit-related impairments