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LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]      
Debt Issuance Costs, Net $ (11)   $ (12)
Total 1,826   2,103
Less current portion 288   486
Long-term debt, less current portion $ 1,538   $ 1,617
Weighted-average fixed-interest rate 3.60%   4.10%
Weighted-average variable-interest rate 3.60%   3.90%
Long-term debt payments $ 532 $ 258  
Repayments of Debt 392    
Fixed rate notes payable due through 2028 [Member]      
Debt Instrument [Line Items]      
Total 582   $ 642
Variable rate notes payable due through 2028 [Member]      
Debt Instrument [Line Items]      
Total $ 1,255   $ 1,473