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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 161 | $ 185
Accumulated depreciation | 6,542 | 6,055
Accumulated amortization | $ 429 | $ 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) | 73,000,000 | 74,000,000
Treasury stock (in shares) | 38,000,000 | 37,000,000

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