v3.8.0.1

Share-based Compensation Expense (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Share-based Compensation Expense for all Stock Awards | Share-based compensation expense for all stock awards consists of the following (in millions):
| Years Ended
| December 31, 2017 |  | January 1, 2017 |  | January 3, 2016
Cost of product revenue | $ | 12 |  |  | $ | 9 |  |  | $ | 10 |
Cost of service and other revenue | 2 |  |  | 2 |  |  | 2 |
Research and development | 51 |  |  | 42 |  |  | 42 |
Selling, general and administrative | 99 |  |  | 76 |  |  | 79 |
Share-based compensation expense before taxes | 164 |  |  | 129 |  |  | 133 |
Related income tax benefits | (48 | ) |  | (41 | ) |  | (39 | )
Share-based compensation expense, net of taxes | $ | 116 |  |  | $ | 88 |  |  | $ | 94 |
Summary of Assumptions used to Estimate the Weighted-Average Fair Value Per Share for Stock Purchase under the Employee Stock Purchase Plan | The assumptions used for the specified reporting periods and the resulting estimates of weighted-average fair value per share for stock purchased under the ESPP are as follows:
| Years Ended
| December 31, 2017 |  | January 1, 2017 |  | January 3, 2016
Risk-free interest rate | 0.50% - 1.22% |  |  | 0.40% - 0.50% |  |  | 0.07% - 0.33% |
Expected volatility | 29% - 44% |  |  | 40% - 44% |  |  | 29% - 38% |
Expected term | 0.5 - 1.0 year |  |  | 0.5 - 1.0 year |  |  | 0.5 - 1.0 year |
Expected dividends | 0 | % |  | 0 | % |  | 0 | %
Weighted-average grant-date fair value per share | $ | 46.81 |  |  | $ | 48.29 |  |  | $ | 53.92 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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