INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized	[1]	$ (137)	$ 0	$ (143)	$ (31)
Derivative gains (losses)		(3)	(17)	(17)	(67)
Other		0	0	0	(1)
Total realized investment gains (losses)		(114)	16	26	72
Fixed maturities:
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(110)	33	14	140
Perpetual securities:
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		0	0	30	0
Equity securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized		(1)	0	(1)	0
Total realized investment gains (losses)		(1)	0	(1)	0
Derivatives and other
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(3)	(17)	(17)	(68)
Available-for-sale securities | Fixed maturities:
Gain (Loss) on Investments [Line Items]
Gross gains from sales		20	17	124	144
Gross losses from sales		(6)	0	(6)	(1)
Net gains (losses) from redemptions		12	16	38	27
Other-than-temporary impairment losses realized		(136)	0	(142)	(31)
Available-for-sale securities | Perpetual securities:
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		0	0	30	0
Held-to-maturity securities | Fixed maturities:
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		$ 0	$ 0	$ 0	$ 1

[1] Includes $6 and $0 for the three-month periods and $12 and $31 for the nine-month periods ended September 30, 2015 and 2014, respectively, from change in intent to sell securities; and $131 for the three- and nine-month periods ended September 30, 2015, for credit-related impairment