INVESTMENTS - Information Regarding Pretax Net Gains and Losses From Investments (Detail) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019
Gain (Loss) on Securities [Line Items]
Loan loss reserves	[1]	$ 0	$ (5)		$ 0	$ (8)
Total net investment gains (losses)		108	(153)		(525)	(147)
Credit Losses
Fixed maturity securities available for sale		0	(13)	[2]	(75)	(13)	[2]
Fixed maturity securities held to maturity		0	0		1	0
Commercial mortgage and other loans		78	0		(86)	0
Loan commitments		64	0		(17)	0
Reinsurance recoverable and other		0	0		(2)	0
Total credit losses		142	(13)		(179)	(13)
Derivatives and Other
Derivative gains (losses)		138	(146)		173	(24)
Foreign currency gains (losses)		(186)	21		(356)	(181)
Derivatives and other
Gain (Loss) on Securities [Line Items]
Total net investment gains (losses)		(48)	(125)		(183)	(205)
Equity securities
Gain (Loss) on Securities [Line Items]
Total net investment gains (losses)		12	18		(106)	65
Fixed maturity securities
Gain (Loss) on Securities [Line Items]
Gross gains from sales		7	11		28	55
Gross losses from sales		0	(18)		(46)	(29)
Foreign currency gains (losses) on sales and redemptions		(5)	(21)		(39)	(12)
Total net investment gains (losses)		$ 2	$ (28)		$ (57)	$ 14

[1] U.S. GAAP guidance adopted as of January 1, 2020 has superseded these losses, included for comparative purposes only

[2] Includes other-than-temporary impairment losses for prior year