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Quarterly financial data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial data (unaudited) | Quarterly financial data is summarized as follows (in millions, except per-share data):
| 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 |
| 2017 Quarters ended
| December 31 |  | September 30 |  | June 30 |  | March 31
Product sales | $ | 5,569 |  |  | $ | 5,453 |  |  | $ | 5,574 |  |  | $ | 5,199 |
Gross profit from product sales | $ | 4,510 |  |  | $ | 4,463 |  |  | $ | 4,550 |  |  | $ | 4,203 |
Net (loss) income | $ | (4,264 | ) |  | $ | 2,021 |  |  | $ | 2,151 |  |  | $ | 2,071 |
(Loss) earnings per share: |  |  |  |  |  |  |
Basic | $ | (5.89 | ) |  | $ | 2.78 |  |  | $ | 2.93 |  |  | $ | 2.81 |
Diluted(1) | $ | (5.89 | ) |  | $ | 2.76 |  |  | $ | 2.91 |  |  | $ | 2.79 |
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(1) | During periods of net loss, diluted loss per share is equal to basic loss per share because the antidilutive effect of potential common shares is disregarded.

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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=109225645&loc=d3e1280-108306 + Details
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