INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized	[1]	$ (33)	$ 0	$ (47)	$ (6)
Derivative gains (losses)		(167)	35	(171)	(14)
Total realized investment gains (losses)		(187)	127	(114)	140
Derivatives and other
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(167)	35	(171)	(14)
Fixed maturities:
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(20)	62	49	124
Perpetual securities:
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized		0	0	(2)	0
Total realized investment gains (losses)		30	30	38	30
Equity securities
Gain (Loss) on Investments [Line Items]
Gross gains from sales		2	0	5	0
Gross losses from sales		(8)	0	(11)	0
Other-than-temporary impairment losses realized		(24)	0	(24)	0
Total realized investment gains (losses)		(30)	0	(30)	0
Available-for-sale securities | Fixed maturities:
Gain (Loss) on Investments [Line Items]
Gross gains from sales		6	55	8	104
Gross losses from sales		(12)	0	(16)	0
Net gains (losses) from redemptions		(5)	7	78	26
Other-than-temporary impairment losses realized		(9)	0	(21)	(6)
Available-for-sale securities | Perpetual securities:
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		30	30	40	30
Other-than-temporary impairment losses realized		$ 0	$ 0	$ (2)	$ 0

[1] Includes $33 and an immaterial amount for the three-month periods and $47 and $6 for the six-month periods ended June 30, 2016 and 2015, respectively, from change in intent to sell securities or change in intent to hold securities until recovery