INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Gain (Loss) on Securities [Line Items]
Other-than-temporary impairment losses realized		$ (5)			$ (17)
Loan loss reserves		(5)	$ (1)		(15)	$ (4)
Derivative gains (losses)		(162)	(40)		(190)	(143)
Foreign currency gains (losses)		159	17		123	(56)
Total realized investment gains (losses)		56	30		(76)	(166)
Other-than-temporary impairment losses			(8)			(27)
Derivatives and other
Gain (Loss) on Securities [Line Items]
Total realized investment gains (losses)		(3)	(23)		(67)	(199)
Equity securities
Gain (Loss) on Securities [Line Items]
Total realized investment gains (losses)	[1],[2]	27	39	[3]	(1)	73	[3]
Other-than-temporary impairment losses			(6)			(18)
Available-for-sale securities | Fixed maturities
Gain (Loss) on Securities [Line Items]
Gross gains from sales	[1]	60	18		81	40
Gross losses from sales	[1]	(26)	(5)		(99)	(24)
Foreign exchange gains (losses)	[1]	3	3		27	(47)
Other-than-temporary impairment losses realized	[1]	0	(1)		(2)	(5)
Total realized investment gains (losses)	[1]	$ 37	$ 15		$ 7	$ (36)

[1] Includes perpetual securities

[2] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.

[3] Includes impairments of $6 for the three-month period and $18 for the nine-month period ended September 30, 2017