Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details)

v2.4.1.9
Acquisitions (Details)
In Billions, except Per Share data, unless otherwise specified
Mar. 29, 2015
GBP (£)
Apr. 21, 2015
Subsequent Event
Apr. 21, 2015
United Kingdom, Pounds
Subsequent Event
GBP (£)
Apr. 21, 2015
United States of America, Dollars
Subsequent Event
USD ($)
Business Acquisition [Line Items]        
Business Acquisition, Share Price £ 9.00us-gaap_BusinessAcquisitionSharePrice      
Business Acquisition, Total Price     £ 1.6qcom_BusinessAcquisitionTotalPrice
/ us-gaap_CurrencyAxis
= currency_GBP
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
$ 2.3qcom_BusinessAcquisitionTotalPrice
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Foreign Currency Exchange Rate, Remeasurement   1.4929us-gaap_ForeignCurrencyExchangeRateRemeasurement1
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= us-gaap_SubsequentEventMember