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Commitments And Contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended
Apr. 04, 2015
Jan. 03, 2015
Jan. 03, 2015
Mar. 30, 2013
Dec. 17, 2014
May 01, 2015
March 2010 Securities Class Action            
Commitments And Contingencies            
Litigation Settlement, Expense   $ 50us-gaap_LitigationSettlementExpense
/ us-gaap_LitigationCaseAxis
= stj_March2010SecuritiesClassActionMember
       
Minimum damage loss claimed     475us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= stj_March2010SecuritiesClassActionMember
     
Proceeds from Insurance Settlement, Operating Activities 40us-gaap_ProceedsFromInsuranceSettlementOperatingActivities
/ us-gaap_LitigationCaseAxis
= stj_March2010SecuritiesClassActionMember
         
December 2012 Securities Litigation            
Commitments And Contingencies            
Number of cases consolidated       2stj_Numberofcasesconsolidated
/ us-gaap_LitigationCaseAxis
= stj_December2012SecuritiesLitigationMember
   
Riata Litigation            
Commitments And Contingencies            
Litigation Settlement, Expense   $ 15us-gaap_LitigationSettlementExpense
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
       
Loss Contingency, Claims Settled, Number   950us-gaap_LossContingencyClaimsSettledNumber
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
       
Number of resolved multi-plaintiff lawsuits, excluding class action lawsuits   8stj_Numberofresolvedmultiplaintifflawsuitsexcludingclassactionlawsuits
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
8stj_Numberofresolvedmultiplaintifflawsuitsexcludingclassactionlawsuits
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
     
Riata Litigation | Minimum            
Commitments And Contingencies            
Number of lawsuits outstanding         70stj_Numberoflawsuitsoutstanding
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Riata Litigation | Subsequent Event            
Commitments And Contingencies            
Number of lawsuits outstanding           4stj_Numberoflawsuitsoutstanding
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Riata Litigation | State and Federal Courts of California            
Commitments And Contingencies            
Number of claimants in lawsuit   173stj_NumberOfClaimantsInLawsuit
/ us-gaap_LitigationCaseAxis
= stj_StateandFederalCourtsofCaliforniaMember
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
173stj_NumberOfClaimantsInLawsuit
/ us-gaap_LitigationCaseAxis
= stj_StateandFederalCourtsofCaliforniaMember
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember