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Financial Instruments (Cash, Cash Equivalents, and Marketable Securities Fair Value Measurements) (Details) - USD ($) $ in Millions | Sep. 29, 2018 | Dec. 30, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |  |
Total Fair Value |  | $ 1,056 | $ 1,185
Cash and Cash Equivalents |  | 1,046 | 1,185
Short-Term Marketable Securities | [1] | 10 | 0
Level 1 |  |  |
Schedule of Investments [Line Items] |  |  |
Total Fair Value |  | 205 | 395
Cash and Cash Equivalents |  | 205 | 395
Short-Term Marketable Securities |  | 0 |
Level 2 |  |  |
Schedule of Investments [Line Items] |  |  |
Total Fair Value |  | 759 | 682
Cash and Cash Equivalents |  | 749 | 682
Short-Term Marketable Securities |  | 10 |
Cash |  |  |
Schedule of Investments [Line Items] |  |  |
Total Fair Value |  | 92 | 108
Cash and Cash Equivalents |  | 92 | 108
Short-Term Marketable Securities |  | 0 |
Government money market funds | Level 1 |  |  |
Schedule of Investments [Line Items] |  |  |
Total Fair Value |  | 205 | 395
Cash and Cash Equivalents |  | 205 | 395
Short-Term Marketable Securities |  | 0 |
Commercial paper | Level 2 |  |  |
Schedule of Investments [Line Items] |  |  |
Total Fair Value |  | 759 | 682
Cash and Cash Equivalents |  | 749 | $ 682
Short-Term Marketable Securities |  | $ 10 |
[1] | Prior year amounts adjusted to reflect the retrospective application of ASU 2014-09, Revenue from Contracts with Customers. Refer to Note 1.

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