INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized	[1]	$ 0	$ (28)	$ (6)	$ (31)
Derivative gains (losses)		35	33	(14)	(50)
Other		0	0	0	(1)
Total realized investment gains (losses)		127	102	140	56
Fixed maturities:
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		62	69	124	107
Perpetual securities:
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		30	0	30	0
Derivatives and other
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		35	33	(14)	(51)
Available-for-sale Securities | Fixed maturities:
Gain (Loss) on Investments [Line Items]
Gross gains from sales		55	92	104	127
Gross losses from sales		0	0	0	(1)
Net gains (losses) from redemptions		7	4	26	11
Other-than-temporary impairment losses realized		0	(28)	(6)	(31)
Available-for-sale Securities | Perpetual securities:
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		30	0	30	0
Held-to-maturity Securities [Member] | Fixed maturities:
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		$ 0	$ 1	$ 0	$ 1

[1] Includes an immaterial amount and $28 for the three-month periods and $6 and $31 for the six-month periods ended June 30, 2015 and 2014, respectively, from change in intent to sell securities