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Basis of Presentation and Significant Accounting Policies (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 02, 2016 USD ($) | Oct. 01, 2017 USD ($) Operating_Segment | Oct. 02, 2016 USD ($) | Sep. 28, 2016 $ / shares | Jun. 24, 2016 $ / shares
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Number of business segments | Operating_Segment |  |  | 2 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net tax benefit |  | $ 35 |  | $ 85 |  |
Amount reclassified from operating activities | [1],[2] |  | $ (9,728) | (10,151) |  |
Amount reclassified to financing activities | [1],[2] |  | $ (9,650) | (6,915) |  |
Medivation [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, per share in cash (in dollars per share) | $ / shares |  |  |  |  | $ 81.50 |
Anacor [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, per share in cash (in dollars per share) | $ / shares |  |  |  |  |  | $ 99.25
Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Amount reclassified from operating activities |  |  |  | 87 |  |
Amount reclassified to financing activities |  |  |  | $ 87 |  |
[1] | Amounts for the three and nine months ended October 2, 2016 have been revised from previously reported amounts to reflect the adoption of a new accounting standard in the fourth quarter of 2016, as of January 1, 2016. For additional information, see Note 1B. Basis of Presentation and Significant Accounting Policies: Adoption of New Accounting Standards.
[2] | Amounts may not add due to rounding.

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