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Earnings per share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share The computation of basic earnings per share (EPS) is based on the weighted-average number of our common shares outstanding. The computation of diluted EPS is based on the weighted-average number of our common shares outstanding and dilutive potential common shares, which include primarily shares that may be issued under our stock option, restricted stock and performance unit award programs, as determined by using the treasury stock method (collectively, dilutive securities). The computations for basic and diluted EPS were as follows (in millions, except per-share data):
| Three months ended March 31,
| 2018 |  | 2017
Income (Numerator): |  |  |
Net income for basic and diluted EPS | $ | 2,311 |  |  | $ | 2,071 |
Shares (Denominator): |  |  |
Weighted-average shares for basic EPS | 707 |  |  | 737 |
Effect of dilutive securities | 4 |  |  | 4 |
Weighted-average shares for diluted EPS | 711 |  |  | 741 |
Basic EPS | $ | 3.27 |  |  | $ | 2.81 |
Diluted EPS | $ | 3.25 |  |  | $ | 2.79 |
The decrease in weighted-average shares during three months ended March 31, 2018 compared to the prior period, was due to share repurchases. See Note 11, Stockholders’ equity. For the three months ended March 31, 2018 and 2017, the number of anti-dilutive employee stock-based awards excluded from the computation of diluted EPS was not significant.

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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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