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Condensed Consolidated Balance Sheet (Parenthetical) - $ / shares
shares in Millions
Sep. 30, 2017
Dec. 31, 2016
Condensed Consolidated Balance Sheet [Abstract]    
Common stock, without par value
Common stock, shares authorized 9,000 9,000
Common stock, shares issued 8,019 8,019
Common stock held in treasury, shares 3,782 3,871