INVESTMENTS - Information Regarding Pretax Net Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Gain (Loss) on Securities [Line Items]
Loan loss reserves	[1]	$ 0	$ (2)	$ 0	$ (4)
Total net investment gains (losses)		(170)	(66)	(633)	5
Credit Losses
Fixed maturity securities available for sale		(12)	0	(75)	0
Fixed maturity securities held to maturity		0	0	1	0
Commercial mortgage and other loans		(127)	0	(164)	0
Loan commitments		(35)	0	(81)	0
Reinsurance recoverable and other		(2)	0	(2)	0
Total credit losses		(176)	0	(321)	0
Derivatives and Other
Derivative gains (losses)		120	122	35	122
Foreign currency gains (losses)		(93)	(200)	(170)	(202)
Derivatives and other
Gain (Loss) on Securities [Line Items]
Total net investment gains (losses)		27	(78)	(135)	(80)
Equity securities
Gain (Loss) on Securities [Line Items]
Total net investment gains (losses)		31	(11)	(118)	47
Fixed maturity securities
Gain (Loss) on Securities [Line Items]
Gross gains from sales		14	32	21	44
Gross losses from sales		(46)	(3)	(46)	(11)
Foreign currency gains (losses) on sales and redemptions		(20)	(4)	(34)	9
Total net investment gains (losses)		$ (52)	$ 25	$ (59)	$ 42

[1] U.S. GAAP guidance adopted as of January 1, 2020 has superseded these losses, included for comparative purposes only.