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Income per Share Income per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Weighted average shares outstanding and antidilutive shares [Line Items] |
Weighted average shares outstanding and antidilutive shares [Table Text Block] | A reconciliation of the number of shares used for the basic and diluted income per share computations is as follows:
| Year Ended December 31
Millions of shares | 2017 | 2016 | 2015
Basic weighted average common shares outstanding | 870 |  | 861 |  | 853 |
Dilutive effect of awards granted under our stock incentive plans | — |  | — |  | — |
Diluted weighted average common shares outstanding | 870 |  | 861 |  | 853 |
Antidilutive shares: |  |  |
Options with exercise price greater than the average market price | 6 |  | 11 |  | 10 |
Options which are antidilutive due to net loss position | 2 |  | 1 |  | 2 |
Total antidilutive shares | 8 |  | 12 |  | 12 |

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- Definition [Line Items] for Schedule for the basic and diluted weighted average common shares oustanding and securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities. + References No definition available. + Details
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- Definition [Table Text Block] for Schedule for the basic and diluted weighted average common shares oustanding and securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities. + References No definition available. + Details
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