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LONG-TERM DEBT AND LINES OF CREDIT Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
line of credit expiration date Mar. 31, 2022  
Line of credit, maximum borrowing capacity $ 1,500  
Revolving line of credit, outstanding balance $ 0  
Prior Credit Facility    
line of credit expiration date Sep. 30, 2018  
Line of credit, maximum borrowing capacity   $ 1,000
7.00 Debenture [Member]    
Repayments of debt $ 62