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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Statement of Financial Position [Abstract]      
Common stock, par value (USD per share) $ 1.00 $ 1.00 $ 1.00
Common stock authorized (in shares) 1,000,000,000 1,000,000,000 1,000,000,000
Common stock issued (in shares) 441,400,000 441,400,000 441,400,000
Treasury stock (in shares) 94,700,000 96,100,000 96,200,000