INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized		$ (9)		$ (33)		$ (19)		$ (47)
Derivative gains (losses)		(51)		(167)		(103)		(171)
Foreign currency gains (losses)		(1)		(45)		(73)		(89)
Total realized investment gains (losses)		(56)		(223)		(196)		(194)
Derivatives and other
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(52)		(212)		(176)		(260)
Fixed maturities
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(23)		(11)		(58)		58
Perpetual securities
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		4		30		4		38
Equity securities
Gain (Loss) on Investments [Line Items]
Gross gains from sales		23		2		48		5
Gross losses from sales		(2)		(8)	[1]	(2)		(11)
Other-than-temporary impairment losses realized		(6)		(24)		(12)		(24)
Total realized investment gains (losses)		15		(30)		34		(30)
Available-for-sale securities | Fixed maturities
Gain (Loss) on Investments [Line Items]
Gross gains from sales		5		6		17		8
Gross losses from sales	[1]	(16)		(12)		(31)		(16)
Net gains (losses) from redemptions		(9)	[1]	4		(37)	[1]	87
Other-than-temporary impairment losses realized		(3)		(9)	[1]	(7)		(21)	[1]
Available-for-sale securities | Perpetual securities
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		4		30		4		40
Other-than-temporary impairment losses realized		$ 0		$ 0		$ 0		$ (2)	[1]

[1] Primarily driven by foreign exchange