Cash and Investments, Non-marketable Cost Method Investments (Details) $ in Millions, ¥ in Billions	Sep. 26, 2015 USD ($)	Dec. 27, 2014 CNY (¥)	Dec. 27, 2014 USD ($)
Schedule of Cost-method Investments [Line Items]
Cost Method Investments	$ 3,003		$ 1,769
Beijing UniSpreadtrum Technology Ltd. [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments	966
Beijing UniSpreadtrum Technology Ltd. [Member] | Subject To Regulatory Approvals And Other Closing Conditions [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments		¥ 9.0	$ 1,500
Cost Method Investment, Ownership Percentage		20.00%	20.00%
Beijing UniSpreadtrum Technology Ltd Phase One [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments	$ 966
Beijing UniSpreadtrum Technology Ltd. Phase Two [Member] | Subject To Regulatory Approvals And Other Closing Conditions [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments			$ 500