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Quarterly financial data (unaudited) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial data (unaudited) | Quarterly financial data (unaudited) The following tables summarize the Company’s unaudited financial data on a quarterly basis. The sum of the quarterly earnings (loss) per share amounts may not equal the amount reported for the full year since per share amounts are computed independently for each quarter and for the full year based on respective weighted-average shares outstanding and dilutive securities. 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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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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