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Quarterly financial data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial data (unaudited) | Quarterly financial data is summarized as follows (in millions, except per-share data):
| 2019 Quarters ended
| December 31 |  | September 30 |  | June 30 |  | March 31
Product sales | $ | 5,881 |  |  | $ | 5,463 |  |  | $ | 5,574 |  |  | $ | 5,286 |
Gross profit from product sales | $ | 4,628 |  |  | $ | 4,427 |  |  | $ | 4,562 |  |  | $ | 4,231 |
Net income | $ | 1,703 |  |  | $ | 1,968 |  |  | $ | 2,179 |  |  | $ | 1,992 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 2.87 |  |  | $ | 3.29 |  |  | $ | 3.59 |  |  | $ | 3.20 |
Diluted | $ | 2.85 |  |  | $ | 3.27 |  |  | $ | 3.57 |  |  | $ | 3.18 |
| 2018 Quarters ended
| December 31 |  | September 30 |  | June 30 |  | March 31
Product sales | $ | 6,001 |  |  | $ | 5,510 |  |  | $ | 5,679 |  |  | $ | 5,343 |
Gross profit from product sales | $ | 4,905 |  |  | $ | 4,473 |  |  | $ | 4,655 |  |  | $ | 4,399 |
Net income | $ | 1,928 |  |  | $ | 1,859 |  |  | $ | 2,296 |  |  | $ | 2,311 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 3.04 |  |  | $ | 2.88 |  |  | $ | 3.50 |  |  | $ | 3.27 |
Diluted | $ | 3.01 |  |  | $ | 2.86 |  |  | $ | 3.48 |  |  | $ | 3.25 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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