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Commitments And Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Jan. 03, 2015
Mar. 30, 2013
Dec. 17, 2014
Feb. 20, 2015
Commitments And Contingencies [Line Items]              
Operating Leases, Rent Expense $ 51us-gaap_LeaseAndRentalExpense $ 36us-gaap_LeaseAndRentalExpense $ 44us-gaap_LeaseAndRentalExpense        
Number of open governmental investigations 3stj_Numberofopengovernmentalinvestigations            
March 2010 Securities Class Action [Member]              
Commitments And Contingencies [Line Items]              
Litigation Settlement, Expense       50us-gaap_LitigationSettlementExpense
/ us-gaap_LitigationCaseAxis
= stj_March2010SecuritiesClassActionMember		      
Minimum damage loss claimed 475us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= stj_March2010SecuritiesClassActionMember		            
Estimated Insurance Recoveries 30us-gaap_EstimatedInsuranceRecoveries
/ us-gaap_LitigationCaseAxis
= stj_March2010SecuritiesClassActionMember		     30us-gaap_EstimatedInsuranceRecoveries
/ us-gaap_LitigationCaseAxis
= stj_March2010SecuritiesClassActionMember		      
December 2012 Securities Litigation [Member]              
Commitments And Contingencies [Line Items]              
Number of cases consolidated         2stj_Numberofcasesconsolidated
/ us-gaap_LitigationCaseAxis
= stj_December2012SecuritiesLitigationMember		    
Riata Litigation [Member]              
Commitments And Contingencies [Line Items]              
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 multi-plaintiff lawsuits outstanding, excluding class action lawsuits 8stj_Numberofresolvedmultiplaintifflawsuitsexcludingclassactionlawsuits
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember		     8stj_Numberofresolvedmultiplaintifflawsuitsexcludingclassactionlawsuits
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember		      
Riata Litigation [Member] | State and Federal Courts of California [Member]              
Commitments And Contingencies [Line Items]              
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		      
Riata Litigation [Member] | Minimum [Member]              
Commitments And Contingencies [Line Items]              
Number of lawsuits outstanding           70stj_Numberoflawsuitsoutstanding
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Riata Litigation [Member] | Subsequent Event [Member]              
Commitments And Contingencies [Line Items]              
Number of lawsuits outstanding             3stj_Numberoflawsuitsoutstanding
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Riata Litigation [Member] | Subsequent Event [Member] | Federal Court [Member] | U.S. District Court for the Northern District of Illinois [Member]              
Commitments And Contingencies [Line Items]              
Number of lawsuits outstanding             1stj_Numberoflawsuitsoutstanding
/ us-gaap_LitigationCaseAxis
= stj_U.S.DistrictCourtfortheNorthernDistrictofIllinoisMember
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ stj_TypeOfCourtLitigationAxis
= stj_FederalCourtMember
Riata Litigation [Member] | Subsequent Event [Member] | State Court [Member]              
Commitments And Contingencies [Line Items]              
Number of lawsuits outstanding             2stj_Numberoflawsuitsoutstanding
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ stj_TypeOfCourtLitigationAxis
= stj_StateCourtMember
Riata Litigation [Member] | Subsequent Event [Member] | State Court [Member] | Illinois [Member]              
Commitments And Contingencies [Line Items]              
Number of lawsuits outstanding             1stj_Numberoflawsuitsoutstanding
/ us-gaap_LitigationCaseAxis
= stj_IllinoisMember
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ stj_TypeOfCourtLitigationAxis
= stj_StateCourtMember
Riata Litigation [Member] | Subsequent Event [Member] | State Court [Member] | SOUTH CAROLINA              
Commitments And Contingencies [Line Items]              
Number of lawsuits outstanding             1stj_Numberoflawsuitsoutstanding
/ us-gaap_LitigationCaseAxis
= stpr_SC
/ us-gaap_ProductOrServiceAxis
= stj_RiataLitigationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ stj_TypeOfCourtLitigationAxis
= stj_StateCourtMember