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Consolidated Condensed Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 171 $ 160
Accumulated depreciation 6,182 5,953
Accumulated amortization $ 342 $ 327
Common stock, par value (USD per share) $ 1 $ 1
Common stock, shares authorized (shares) 250,000,000 250,000,000
Common stock, shares issued (shares) 111,000,000 111,000,000
Common stock, shares outstanding (shares) 76,000,000 77,000,000
Treasury stock (shares) 35,000,000 33,000,000