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INCOME TAXES - Provision for Income Taxes Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income tax provision at federal statutory rate $ 982 $ 729 $ 436
States, net of federal benefit, and Puerto Rico 63 49 42
Tax exempt investment income (5) (6) (11)
Health insurance industry fee 268 0 243
Nondeductible executive compensation 19 25 17
Tax reform 0 0 (39)
KMG sale 0 0 (272)
Other, net (20) (34) (25)
Provision for income taxes $ 1,307 $ 763 $ 391