INVESTMENTS - Information Regarding Changes in Unrealized Gains and Losses from Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in unrealized gains (losses):
Changes in unrealized gains (losses)	$ 2,799	$ (2,595)	$ 5,893
Fixed maturities | Available-for-sale securities
Changes in unrealized gains (losses):
Changes in unrealized gains (losses)	2,690	(2,481)	5,629
Fixed maturities | Transferred to held to maturity securities
Changes in unrealized gains (losses):
Changes in unrealized gains (losses)	0	0	(10)
Perpetual securities | Available-for-sale securities
Changes in unrealized gains (losses):
Changes in unrealized gains (losses)	21	(123)	269
Equity securities
Changes in unrealized gains (losses):
Changes in unrealized gains (losses)	$ 88	$ 9	$ 5