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SHORT-TERM DEBT Credit Facility (Details) - USD ($)
$ in Millions
Sep. 15, 2014
Apr. 30, 2016
Jun. 09, 2015
Line of Credit Facility      
Credit facility limit increase     $ 300
Amount outstanding on credit facility   $ 235  
Line of Credit      
Line of Credit Facility      
Initiation date of credit facility Sep. 15, 2014    
Expiration date of credit facility Sep. 15, 2019    
Credit faciity terms (in years) five    
Initial maximum borrowing capacity of credit facility $ 400    
New maximum borrowing capacity of credit facility   $ 700