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LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]      
Debt Issuance Costs, Net $ (10)   $ (12)
Total 1,709   2,103
Less current portion 265   486
Long-term debt, less current portion $ 1,444   $ 1,617
Weighted-average fixed-interest rate 3.40%   4.10%
Weighted-average variable-interest rate 3.20%   3.90%
Long-term debt payments $ 752 $ 544  
Repayments of Debt 532    
Fixed rate notes payable due through 2029 [Member]      
Debt Instrument [Line Items]      
Total 569   $ 642
Variable rate notes payable due through 2029 [Member] [Member]      
Debt Instrument [Line Items]      
Total 1,150   $ 1,473
Variable Rate debt with interest rate swap [Member]      
Debt Instrument [Line Items]      
Total $ 745