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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Properties, accumulated depreciation $ 12,276 $ 11,909
Common stock, par or stated value per share (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 1,350,000,000 1,350,000,000
Common stock, shares outstanding, net of treasury shares (in shares) 272,346,940 284,157,187