Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

v2.4.1.9
Stockholders' Equity (Details) (USD $)
6 Months Ended 1 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Apr. 22, 2015
Mar. 09, 2015
Mar. 04, 2014
Stock repurchase program [Abstract]          
Shares repurchased and retired, shares 50,699,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 27,586,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares      
Payments for Repurchase of Common Stock, Before Commissions $ 3,600,000,000qcom_PaymentsForRepurchaseOfCommonStockBeforeCommissions $ 2,000,000,000qcom_PaymentsForRepurchaseOfCommonStockBeforeCommissions      
Stock Repurchase Program, Remaining Authorized Repurchase Amount 14,500,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1        
Authorized amount       15,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1  
Subsequent Event          
Stock repurchase program [Abstract]          
Shares repurchased and retired, shares     5,061,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Payments for Repurchase of Common Stock, Before Commissions     345,000,000qcom_PaymentsForRepurchaseOfCommonStockBeforeCommissions
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Prior (Replaced) [Member]          
Stock repurchase program [Abstract]          
Stock Repurchase Program, Remaining Authorized Repurchase Amount       2,100,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= qcom_PriorReplacedMember
 
Authorized amount         $ 7,800,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= qcom_PriorReplacedMember