INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized	[1]	$ (22)		$ (137)		$ (69)		$ (143)
Derivative gains (losses)		(107)		(3)		(278)		(17)
Total realized investment gains (losses)		(146)		(114)		(260)		26
Derivatives and other
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(107)		(3)		(278)		(17)
Fixed maturities:
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(23)		(110)		26		14
Perpetual securities:
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized		0		0		(2)		0
Total realized investment gains (losses)		0		0		38		30
Equity securities
Gain (Loss) on Investments [Line Items]
Gross gains from sales		5		0		10		0
Gross losses from sales		0		0		(11)		0
Other-than-temporary impairment losses realized		(21)		(1)		(45)		(1)
Total realized investment gains (losses)		(16)		(1)		(46)		(1)
Available-for-sale securities | Fixed maturities:
Gain (Loss) on Investments [Line Items]
Gross gains from sales		2		20	[2]	10		124
Gross losses from sales		(20)	[2]	(6)		(36)	[2]	(6)
Net gains (losses) from redemptions		(4)	[2]	12	[2]	74	[2]	38
Other-than-temporary impairment losses realized		(1)	[2]	(136)		(22)	[2]	(142)
Available-for-sale securities | Perpetual securities:
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		0		0		40		30
Other-than-temporary impairment losses realized		$ 0		$ 0		$ (2)		$ 0

[1] Includes $22 and $6 for the three-month periods and $69 and $12 for the nine-month periods ended September 30, 2016 and 2015, respectively, from change in intent to sell securities or change in intent to hold securities until recovery; and $131 for the three- and nine-month periods ended September 30, 2015, for credit-related impairments

[2] Primarily driven by foreign exchange