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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
issuer
investment
Mar. 31, 2015
USD ($)
investment
Dec. 31, 2015
USD ($)
Schedule of Investments [Line Items]      
Amortized Cost $ 67,462   $ 62,963
Held to maturity securities transferred to available for sale securities, number of investments | investment 0 0  
Other-than-temporary impairment losses realized [1] $ (14) $ (6)  
Middle Market Loan Receivable 219   118
Middle Market Loan Program Unfunded Amount 75   53
Middle Market Loan Commitment 80    
Commercial Mortgage Loans 33    
Commercial Mortgage Loan Commitments $ 35    
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%    
Available-for-sale Securities $ 74,906   67,794
Parent Company and Other Business Segments      
Schedule of Investments [Line Items]      
Securities available for sale, fixed maturities, amortized cost 526    
Securities available for sale, fixed maturities, fair value 547    
Variable Interest Entity, Consolidated      
Schedule of Investments [Line Items]      
Available-for-sale securities, equity securities 648   363
Securities available for sale, fixed maturities, amortized cost 4,110   3,739
Securities available for sale, fixed maturities, fair value 4,861   4,554
Available-for-sale equity securities, amortized cost basis 683   363
Variable Interest Entity, Not Consolidated      
Schedule of Investments [Line Items]      
Securities available for sale, fixed maturities, amortized cost 4,908   4,731
Securities available for sale, fixed maturities, fair value $ 5,291   5,093
Number of issuers of VIEs not-consolidated | issuer 145    
Bank loans      
Schedule of Investments [Line Items]      
Securities available for sale, fixed maturities, amortized cost $ 1,600   1,400
Securities available for sale, fixed maturities, fair value $ 1,600   $ 1,400
[1] Includes $14 and $6 for the three-month periods ended March 31, 2016 and 2015, respectively, from change in intent to sell securities