Basis of Presentation and Significant Accounting Policies (Details) $ / shares in Units, $ in Millions		3 Months Ended
		Apr. 02, 2017 USD ($) Operating_Segment	Apr. 03, 2016 USD ($)	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			$ 22
Amount reclassified from operating activities	[1]	$ (1,589)	(1,808)
Amount reclassified to financing activities	[1]	$ (4,921)	(7,171)
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			26
Amount reclassified to financing activities			$ 26

[1] Amounts may not add due to rounding.