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Quarterly financial data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial data (unaudited) | Quarterly financial data is summarized as follows (in millions, except per share data):
| 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 |
| 2016 Quarters ended
| December 31 |  | September 30 |  | June 30 |  | March 31
Product sales | $ | 5,663 |  |  | $ | 5,516 |  |  | $ | 5,474 |  |  | $ | 5,239 |
Gross profit from product sales | $ | 4,596 |  |  | $ | 4,489 |  |  | $ | 4,424 |  |  | $ | 4,221 |
Net income | $ | 1,935 |  |  | $ | 2,017 |  |  | $ | 1,870 |  |  | $ | 1,900 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 2.61 |  |  | $ | 2.70 |  |  | $ | 2.49 |  |  | $ | 2.52 |
Diluted | $ | 2.59 |  |  | $ | 2.68 |  |  | $ | 2.47 |  |  | $ | 2.50 |
(1) During periods of net loss, diluted loss per share is equal to basic loss per share as the anti-dilutive 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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