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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 161 $ 157
Accumulated depreciation 6,982 6,825
Accumulated amortization $ 503 $ 476
Common stock, par value (USD per share) $ 1 $ 1
Common stock, shares authorized (in shares) 250,000,000 250,000,000
Common stock, shares issued (in shares) 112,000,000 112,000,000
Common stock, shares outstanding (in shares) 71,000,000 71,000,000
Treasury stock (in shares) 41,000,000 41,000,000