INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment losses realized		$ (83)		$ (153)	$ (31)
Derivative gains (losses)		(255)		(10)	31
Total realized investment gains (losses)		(123)		140	215
Fixed maturities
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		105		116	184
Perpetual securities
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		62		35	0
Equity securities
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		22		0	0
Other-than-temporary impairment losses realized		(57)		(1)	0
Total realized investment gains (losses)		(35)		(1)	0
Derivatives and other
Gain (Loss) on Investments [Line Items]
Total realized investment gains (losses)		(255)		(10)	31
Available-for-sale securities | Fixed maturities
Gain (Loss) on Investments [Line Items]
Gross gains from sales		77		224	192
Gross losses from sales		(134)	[1]	(8)	(12)
Net gains (losses) from redemptions	[1]	186		52	34
Other-than-temporary impairment losses realized		(24)	[1]	(152)	(31)
Available-for-sale securities | Perpetual securities
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		64		35	0
Other-than-temporary impairment losses realized		(2)		0	0
Held-to-maturity Securities | Fixed maturities
Gain (Loss) on Investments [Line Items]
Net gains (losses) from redemptions		$ 0		$ 0	$ 1

[1] Primarily driven by foreign exchange