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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation for basic and diluted earnings per share | The computation for basic and diluted EPS was as follows (in millions, except per share data):
| Years ended December 31,
| 2017 |  | 2016 |  | 2015
Income (Numerator): |  |  |  |  |
Net income for basic and diluted EPS | $ | 1,979 |  |  | $ | 7,722 |  |  | $ | 6,939 |
Shares (Denominator): |  |  |  |  |
Weighted-average shares for basic EPS | 731 |  |  | 748 |  |  | 758 |
Effect of dilutive securities | 4 |  |  | 6 |  |  | 8 |
Weighted-average shares for diluted EPS | 735 |  |  | 754 |  |  | 766 |
Basic EPS | $ | 2.71 |  |  | $ | 10.32 |  |  | $ | 9.15 |
Diluted EPS | $ | 2.69 |  |  | $ | 10.24 |  |  | $ | 9.06 |

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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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