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CONDENSED CONSOLIDATED STATEMENT OF EQUITY - (Parenthetical) - $ / shares
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Cash dividends declared per common share (in dollars per share)       $ 0.54    
Common Stock [Member]            
Cash dividends declared per common share (in dollars per share) $ 0.570 $ 0.570 $ 0.555 $ 0.540 $ 0.540 $ 0.520