INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized	[1]	$ (153)	$ (31)	$ (199)
Derivative gains (losses)		(10)	31	326
Other		0	0	10
Total realized investment gains (losses)		140	215	399
Fixed maturities
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		116	184	135
Perpetual securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized		0	0	(70)
Total realized investment gains (losses)		35	0	(71)
Equity securities
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized		(1)	0	(1)
Total realized investment gains (losses)		(1)	0	(1)
Derivatives and other
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(10)	31	336
Available-for-sale securities | Fixed maturities
Gain (Loss) on Investments [Line Items]
Gross gains from sales		224	192	316
Gross losses from sales		(8)	(12)	(87)
Net gains (losses) from redemptions		52	34	34
Other-than-temporary impairment losses realized		(152)	(31)	(128)
Available-for-sale securities | Perpetual securities
Gain (Loss) on Investments [Line Items]
Gross losses from sales		0	0	(1)
Net gains (losses) from redemptions		35	0	0
Other-than-temporary impairment losses realized		0	0	(70)
Held-to-maturity Securities | Fixed maturities
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		$ 0	$ 1	$ 0

[1] Includes $131 and $45 for the years ended December 31, 2015 and 2013, respectively, for credit-related impairments; $26 for the year ended December 31, 2013 for impairments due to severity and duration of decline in fair value; and $22, $31 and $128 for the years ended December 31, 2015, 2014 and 2013, respectively, from change in intent to sell securities