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Income per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Income per Share | Income per Share Basic income or loss per share is based on the weighted average number of common shares outstanding during the period. Diluted income per share includes additional common shares that would have been outstanding if potential common shares with a dilutive effect had been issued. Antidilutive securities represent potentially dilutive securities which are excluded from the computation of diluted income or loss per share as their impact was antidilutive. 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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