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INCOME TAXES - Provision for Income Taxes Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income tax provision at federal statutory rate $ 729 $ 436 $ 1,407
States, net of federal benefit, and Puerto Rico 49 42 80
Tax exempt investment income (6) (11) (22)
Health insurance industry fee 0 243 0
Nondeductible executive compensation 25 17 36
Tax reform 0 (39) 133
KMG sale 0 (272) 0
Other, net (34) (25) (62)
Provision for income taxes $ 763 $ 391 $ 1,572