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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 188 $ 185
Accumulated depreciation 6,181 6,055
Accumulated amortization $ 406 $ 387
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) 111,000,000 111,000,000
Common stock, shares outstanding (in shares) 74,000,000 74,000,000
Treasury stock (in shares) 37,000,000 37,000,000