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Earnings per share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Computation for basic and diluted earnings per share | 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 |

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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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