Quarterly report pursuant to Section 13 or 15(d)

Cash and Investments, Non-marketable Cost Method Investments (Details)

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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