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Condensed Consolidated Statements of Financial Position (Parentheticals) - $ / shares
Mar. 31, 2020
Dec. 31, 2019
Consolidated Statements of Financial Position (Parentheticals) [Abstract]    
Common shares, par value $ 2.50 $ 2.50
Common shares authorized 1,400,000,000 1,400,000,000
Common shares issued 1,112,277,525 1,112,014,480
Common shares outstanding 678,558,571 692,100,651