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Revenue (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 27, 2019 | Sep. 27, 2019 | Sep. 28, 2018 | Sep. 27, 2019 | Sep. 28, 2018 | Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |  |  |  |  |  |
Revenue, OTLs and STLs |  | $ 108 | $ 115 | $ 321 | $ 308 |
Revenue, remaining performance obligation | $ 2,000 | 2,000 |  | 2,000 |  |
Revenue, remaining performance obligation, expected satisfaction in next 12 months, percent | 39.00% |  |  |  |  |
Revenue, remaining performance obligation, expected satisfaction in subsequent 12 months, percent | 25.00% |  |  |  |  |
Contract with customer, asset, net | $ 77 | 77 |  | 77 |  | $ 82
Contract with customer, liability | $ 801 | $ 801 |  | 801 |  | $ 799
Contract with customer, liability, revenue recognized |  |  |  | $ 544 | $ 568 |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 + Details
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