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INCOME TAXES - Provision for Income Taxes Using Federal Statutory Rate (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income tax provision at federal statutory rate $ 436 $ 1,407 $ 543
States, net of federal benefit, and Puerto Rico 42 80 41
Tax exempt investment income (11) (22) (20)
Health insurance industry fee 243 0 336
Nondeductible executive compensation 17 36 30
Tax reform (39) 133 0
KMG sale (272) 0 0
Other, net (25) (62) 8
Provision for income taxes $ 391 $ 1,572 $ 938