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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of basic and diluted EPS | The table below sets forth the computation of basic and diluted EPS:
| Year ended December 31 |
| 2017 |  |  |  | 2016 |  |  | 2015 |
Basic EPS Calculation |  |  |  |  |  |
Earnings available to common stockholders - Basic 1 | $ | 9,195 |  |  |  | $ | (497 | ) |  | $ | 4,587 |
Weighted-average number of common shares outstanding 2 | 1,882 |  |  |  | 1,872 |  |  | 1,867 |
Add: Deferred awards held as stock units | 1 |  |  |  | 1 |  |  | 1 |
Total weighted-average number of common shares outstanding | 1,883 |  |  |  | 1,873 |  |  | 1,868 |
Earnings per share of common stock - Basic | $ | 4.88 |  |  |  | $ | (0.27 | ) |  | $ | 2.46 |
Diluted EPS Calculation |  |  |  |  |  |
Earnings available to common stockholders - Diluted 1 | $ | 9,195 |  |  |  | $ | (497 | ) |  | $ | 4,587 |
Weighted-average number of common shares outstanding 2 | 1,882 |  |  |  | 1,872 |  |  | 1,867 |
Add: Deferred awards held as stock units | 1 |  |  |  | 1 |  |  | 1 |
Add: Dilutive effect of employee stock-based awards | 15 |  |  |  | — |  |  | 7 |
Total weighted-average number of common shares outstanding | 1,898 |  |  |  | 1,873 |  |  | 1,875 |
Earnings per share of common stock - Diluted | $ | 4.85 |  |  |  | $ | (0.27 | ) |  | $ | 2.45 |
1 There was no effect of dividend equivalents paid on stock units or dilutive impact of employee stock-based awards on earnings.
2 Millions of shares; 10 million shares of employee-based awards were not included in the 2016 diluted EPS calculation as the result would be anti-dilutive.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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