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INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (Loss) on Securities [Line Items]      
Loan loss reserves $ (18) $ (19) $ (8)
Derivative gains (losses) (174) (224) (109)
Foreign currency gains (losses) (62) (10) (33)
Total realized investment gains (losses) (135) (430) (151)
Loan receivables      
Gain (Loss) on Securities [Line Items]      
Total realized investment gains (losses) (18) (19) (8)
Derivatives and other      
Gain (Loss) on Securities [Line Items]      
Total realized investment gains (losses) (236) (234) (142)
Equity securities      
Gain (Loss) on Securities [Line Items]      
Total realized investment gains (losses) 101 (131) 71 [1]
Other-than-temporary impairment losses realized     (22)
Available-for-sale securities | Fixed maturity securities      
Gain (Loss) on Securities [Line Items]      
Gross gains from sales 115 101 51
Gross losses from sales (68) (156) (68)
Foreign currency gains (losses) on sales and redemptions (16) 73 (48)
Other-than-temporary impairment losses realized (13) (64) (7)
Total realized investment gains (losses) $ 18 $ (46) $ (72)
[1] Includes impairments of $22 in 2017