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Fair Value Measurements And Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Estimate Not Practicable, Cost Method Investments $ 71us-gaap_FairValueEstimateNotPracticableCostMethodInvestments $ 69us-gaap_FairValueEstimateNotPracticableCostMethodInvestments  
Aggregate fair value, fixed-rate debt obligations 2,357stj_FixedRateDebtObligationsFairValueDisclosure    
Aggregate carrying value, fixed-rate debt obligations 2,273stj_FixedRateDebtObligationsCarryingValue    
Aggregate carrying value, other debt obligations 1,593stj_OtherDebtCarryingValue    
cash equivalents at carrying value excluding money market securities 713stj_CashEquivalentsAtCarryingValueExcludingMoneyMarketSecurities 498stj_CashEquivalentsAtCarryingValueExcludingMoneyMarketSecurities  
Indefinite-lived Intangible Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated fair value after write-down 55us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember		 50us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember		  
Operating Expense [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 58us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember		 29us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember		  
Customer-Related Intangible Assets [Member] | Operating Expense [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of Intangible Assets, Finite-lived   13us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelatedIntangibleAssetsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember		 2us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelatedIntangibleAssetsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
Developed Technology Rights [Member] | Operating Expense [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of Intangible Assets, Finite-lived     31us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
Developed Technology Rights [Member] | Neuromodulation Products [Member] | Operating Expense [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of Intangible Assets, Finite-lived     23us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_ProductOrServiceAxis
= stj_NeuromodulationProductsMember
Estimated fair value after write-down     3us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_ProductOrServiceAxis
= stj_NeuromodulationProductsMember
Developed Technology Rights [Member] | Discontinued Product Line [Member] | Operating Expense [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of Intangible Assets, Finite-lived     8us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
/ us-gaap_ProductOrServiceAxis
= stj_DiscontinuedProductLineMember
Long Lived Asset Charges [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other asset impairment charges $ 25us-gaap_OtherAssetImpairmentCharges
/ us-gaap_RestructuringCostAndReserveAxis
= stj_LongLivedAssetChargesMember		 $ 14us-gaap_OtherAssetImpairmentCharges
/ us-gaap_RestructuringCostAndReserveAxis
= stj_LongLivedAssetChargesMember		 $ 41us-gaap_OtherAssetImpairmentCharges
/ us-gaap_RestructuringCostAndReserveAxis
= stj_LongLivedAssetChargesMember