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LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]      
Debt Issuance Costs, Net $ (12)   $ (15)
Total 2,029   2,569
Less current portion 345   307
Long-term debt, less current portion $ 1,684   $ 2,262
Weighted-average fixed-interest rate 4.10%   4.20%
Weighted-average variable-interest rate 3.40%   2.80%
Long-term debt payments $ 544 $ 265  
Repayments of Debt 231    
Fixed rate notes payable due through 2028 [Member]      
Debt Instrument [Line Items]      
Total 706   $ 959
Variable rate notes payable due through 2028 [Member]      
Debt Instrument [Line Items]      
Total $ 1,335   $ 1,625