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SHORT-TERM DEBT Credit Facility (Details) - USD ($)
$ in Millions
Sep. 15, 2014
Apr. 30, 2017
Jun. 09, 2015
Line of Credit Facility      
Initiation date of credit facility Sep. 15, 2014    
Expiration date of credit facility Sep. 15, 2019    
Initial maximum borrowing capacity of credit facility $ 400    
Credit faciity terms (in years) five    
Credit facility limit increase     $ 300
New maximum borrowing capacity of credit facility   $ 700  
Amount outstanding on credit facility   $ 141