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Derivative Instruments - Additional Information (Details) (USD $)
3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Sep. 27, 2014
Derivative [Line Items]      
Hedging Period for Foreign Currency Transactions, Maximum 4 years    
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a net liability position by counterparty $ 33,000,000us-gaap_DerivativeNetLiabilityPositionAggregateFairValue   $ 34,000,000us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 354,000,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths    
Foreign exchange | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative, Notional Amount 4,200,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
  4,300,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Interest Expense      
Derivative [Line Items]      
Net gains (losses) on foreign currency denominated assets and liabilities 12,000,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
12,000,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
 
Interest Expense | Interest rate      
Derivative [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 25,000,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
22,000,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
 
Fair Value Hedging | Interest rate | Derivatives Designated as Hedges      
Derivative [Line Items]      
Derivative, Notional Amount 5,800,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  6,800,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Cash Flow Hedging | Foreign exchange | Derivatives Designated as Hedges      
Derivative [Line Items]      
Derivative, Notional Amount $ 5,600,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
  $ 5,000,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember