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Revenue - Remaining Performance Obligations to be Recognized as Revenue (Details) - USD ($) $ in Billions | 6 Months Ended | 12 Months Ended
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Jul. 01, 2018 | Dec. 31, 2017
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-01-01 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue, remaining performance obligations | $ 66.3 | $ 63.2
Revenue, remaining performance obligation, expected timing of satisfaction, period |  | 1 year
Revenue, remaining performance obligation, percentage recognized |  | 40.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 1 year | 2 years
Revenue, remaining performance obligation, percentage recognized | 60.00% | 40.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 2 years |
Revenue, remaining performance obligation, percentage recognized | 25.00% |

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- Definition Revenue, Remaining Performance Obligation, Percentage Recognized + References No definition available. + Details
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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045 + Details
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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 + Details
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