INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Gain (Loss) on Securities [Line Items]
Other-than-temporary impairment losses realized		$ (5)			$ (12)
Loan loss reserves		(3)	$ (2)		(10)	$ (3)
Derivative gains (losses)		(172)	(51)		(28)	(103)
Foreign currency gains (losses)		192	(1)		(36)	(73)
Total realized investment gains (losses)		3	(56)		(131)	(196)
Other-than-temporary impairment losses			(9)			(19)
Derivatives and other
Gain (Loss) on Securities [Line Items]
Total realized investment gains (losses)		20	(52)		(64)	(176)
Equity securities
Gain (Loss) on Securities [Line Items]
Total realized investment gains (losses)	[1],[2]	18	15	[3]	(28)	34	[3]
Other-than-temporary impairment losses			(6)			(12)
Available-for-sale securities | Fixed maturities
Gain (Loss) on Securities [Line Items]
Gross gains from sales	[1]	12	10		22	22
Gross losses from sales	[1]	(71)	(8)		(73)	(19)
Foreign exchange gains (losses)	[1]	29	(18)		24	(50)
Other-than-temporary impairment losses realized	[1]	(2)	(1)		(2)	(4)
Total realized investment gains (losses)	[1]	$ (32)	$ (17)		$ (29)	$ (51)

[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 $12 for the six-month period ended June 30, 2017