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COMMON EQUITY - COMMON STOCK DIVIDENDS (Details) - $ / shares
3 Months Ended 9 Months Ended
Oct. 19, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dividends Payable          
Quarterly cash dividend declared (in dollars per share)   $ 0.520 $ 0.495 $ 1.560 $ 1.485
Subsequent event          
Dividends Payable          
Quarterly cash dividend declared (in dollars per share) $ 0.52