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INVESTMENTS - Information Regarding Changes in Unrealized Gains and Losses from Investments (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Changes in unrealized gains (losses):      
Changes in unrealized gains (losses) $ (2,595) $ 5,893 $ (2,418)
Fixed maturities | Available-for-sale securities      
Changes in unrealized gains (losses):      
Changes in unrealized gains (losses) (2,481) 5,629 (2,281)
Fixed maturities | Transferred to held to maturity securities      
Changes in unrealized gains (losses):      
Changes in unrealized gains (losses) 0 (10) (9)
Perpetual securities | Available-for-sale securities      
Changes in unrealized gains (losses):      
Changes in unrealized gains (losses) (123) 269 (129)
Equity securities      
Changes in unrealized gains (losses):      
Changes in unrealized gains (losses) $ 9 $ 5 $ 1