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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Income Taxes |  |  |  |
Effective income tax rate (as a percent) | 21.70% |  | 23.60% |
Discrete tax benefit | $ 15 |  |  |
Income tax benefit (expense) | $ (44) | $ 192 | $ (127) | $ 46
Effective tax rate, favorable impact from research and development |  | 9 |  |
Effective tax rate, favorable impact from foreign tax rate differentials |  | 7 |  |
Internal Revenue Service (IRS) | Approval of 1998 To 2008 tax years final settlement | Continuing Operations |  |  |  |
Income Taxes |  |  |  |
Income tax benefit on continuing operations |  | 206 |  | 206
Internal Revenue Service (IRS) | Approval of 1998 To 2008 tax years final settlement | Discontinued Operations |  |  |  |
Income Taxes |  |  |  |
Income tax benefit on discontinued operations |  | $ 113 |  | $ 113

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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