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Earnings per share (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, |  | Nine months ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Income (Numerator): |  |  |  |  |  |  |
Net income for basic and diluted EPS | $ | 1,884 |  |  | $ | 2,021 |  |  | $ | 3,994 |  |  | $ | 5,649 |
Shares (Denominator): |  |  |  |  |  |  |
Weighted-average shares for basic EPS | 567 |  |  | 585 |  |  | 572 |  |  | 588 |
Effect of dilutive securities | 3 |  |  | 4 |  |  | 4 |  |  | 4 |
Weighted-average shares for diluted EPS | 570 |  |  | 589 |  |  | 576 |  |  | 592 |
Basic EPS | $ | 3.32 |  |  | $ | 3.45 |  |  | $ | 6.98 |  |  | $ | 9.61 |
Diluted EPS | $ | 3.31 |  |  | $ | 3.43 |  |  | $ | 6.93 |  |  | $ | 9.54 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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