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INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gain (Loss) on Investments [Line Items]      
Other-than-temporary impairment losses realized $ (37) $ (85) $ (154)
Loan loss reserves (8) (2) (1)
Derivative gains (losses) (109) (255) (10)
Foreign currency transaction gain (loss), realized (33) 186 (32)
Total realized investment gains (losses) (151) (14) 106
Equity securities      
Gain (Loss) on Investments [Line Items]      
Gross gains from sales 104 0 0
Gross losses from sales (11) 0 0
Net gains (losses) from redemptions 0 22 0
Other-than-temporary impairment losses realized (22) (57) (1)
Total realized investment gains (losses) 71 (35) (1)
Derivatives and other      
Gain (Loss) on Investments [Line Items]      
Total realized investment gains (losses) (142) (70) (42)
Available-for-sale securities | Fixed maturities      
Gain (Loss) on Investments [Line Items]      
Gross gains from sales 36 77 224
Gross losses from sales (82) (134) (8)
Net gains (losses) from redemptions (23) 112 51
Other-than-temporary impairment losses realized (7) (24) (152)
Total realized investment gains (losses) (76) 31 115
Available-for-sale securities | Perpetual securities      
Gain (Loss) on Investments [Line Items]      
Net gains (losses) from redemptions 4 64 35
Other-than-temporary impairment losses realized 0 (2) 0
Total realized investment gains (losses) $ 4 $ 62 $ 35