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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2019
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 June 30, |  | Six months ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Income (Numerator): |  |  |  |  |  |  |
Net income for basic and diluted EPS | $ | 2,179 |  |  | $ | 2,296 |  |  | $ | 4,171 |  |  | $ | 4,607 |
Shares (Denominator): |  |  |  |  |  |  |
Weighted-average shares for basic EPS | 607 |  |  | 656 |  |  | 615 |  |  | 682 |
Effect of dilutive securities | 3 |  |  | 4 |  |  | 3 |  |  | 3 |
Weighted-average shares for diluted EPS | 610 |  |  | 660 |  |  | 618 |  |  | 685 |
Basic EPS | $ | 3.59 |  |  | $ | 3.50 |  |  | $ | 6.78 |  |  | $ | 6.76 |
Diluted EPS | $ | 3.57 |  |  | $ | 3.48 |  |  | $ | 6.75 |  |  | $ | 6.73 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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