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Revenues - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Capitalized Contract Cost [Line Items] |  |  |  |  |
Remaining performance obligation | $ 687 |  | $ 687 |  | $ 489
Remaining performance obligation, expected recognition period | 2 years |  | 2 years |  |
Increase driven by payments received or due in advance of satisfying performance obligations | $ 418 |  | $ 418 |  | 382
Revenue recognized that was included in contract liability | 57 | $ 55 | 127 | $ 120 |
Prepaid expenses and other current assets |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Contract assets recorded in prepaids and other current assets | $ 7 |  | $ 7 |  | $ 5

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