INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized	[1]	$ (14)	$ (6)
Derivative gains (losses)		(4)	(49)
Total realized investment gains (losses)		73	13
Derivatives and other
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(4)	(49)
Fixed maturities:
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		69	62
Perpetual securities:
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized		(2)	0
Total realized investment gains (losses)		8	0
Available-for-sale securities | Fixed maturities:
Gain (Loss) on Investments [Line Items]
Gross gains from sales		2	49
Gross losses from sales		(4)	0
Net gains (losses) from redemptions		83	19
Other-than-temporary impairment losses realized		(12)	(6)
Available-for-sale securities | Perpetual securities:
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		10	0
Other-than-temporary impairment losses realized		$ (2)	$ 0

[1] Includes $14 and $6 for the three-month periods ended March 31, 2016 and 2015, respectively, from change in intent to sell securities