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Income (Loss) per Share | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Income (Loss) per Share | Income per Share Basic income 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 shares represent potential common shares which are excluded from the computation of diluted income per share as their impact would be antidilutive. A reconciliation of the number of shares used for the basic and diluted income per share computations is as follows:
| Three Months Ended March 31
Millions of shares | 2019 | 2018
Basic weighted average common shares outstanding | 873 |  | 875 |
Dilutive effect of awards granted under our stock incentive plans | — |  | 3 |
Diluted weighted average common shares outstanding | 873 |  | 878 |
Antidilutive shares: |  |
Options with exercise price greater than the average market price | 20 |  | 7 |
Total antidilutive shares | 20 |  | 7 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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