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DEBT - Interest Paid (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest paid        
Interest paid   $ 155 $ 175 $ 198
Debt extinguishment costs $ 104 $ 0 $ 104 $ 40