Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details)

v2.4.1.9
Acquisitions (Details)
3 Months Ended
Dec. 28, 2014
GBP (£)
Dec. 28, 2014
United Kingdom, Pounds
GBP (£)
Dec. 28, 2014
United States of America, Dollars
USD ($)
Business Acquisition [Line Items]      
Foreign Currency Exchange Rate, Remeasurement 1.51571us-gaap_ForeignCurrencyExchangeRateRemeasurement1    
Agreed Purchase Price Per Share for Announced Acquisition £ 9.00qcom_AgreedAcquisitionPurchasePricePerShare    
Agreed Purchase Price for Announced Acquisition   £ 1,600,000,000qcom_AgreedAcquisitionPurchasePrice
/ us-gaap_CurrencyAxis
= currency_GBP
$ 2,400,000,000qcom_AgreedAcquisitionPurchasePrice
/ us-gaap_CurrencyAxis
= currency_USD