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Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Sep. 30, 2017
Derivative [Line Items]      
Hedging Period for Foreign Currency Transactions, Maximum 4 years    
Net deferred gains recorded in AOCI for contracts that will mature in the next twelve months $ 64    
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a net liability position by counterparty 269   $ 217
Interest rate | Interest Expense      
Derivative [Line Items]      
Realized net benefits from derivative instruments 7 $ 12  
Derivatives designated as hedges | Interest rate | Fair Value Hedging      
Derivative [Line Items]      
Derivative, Notional Amount 7,800   8,200
Derivatives designated as hedges | Foreign exchange | Cash Flow Hedging      
Derivative [Line Items]      
Derivative, Notional Amount 6,700   6,300
Not Designated as Hedging Instrument | Interest rate      
Derivative [Line Items]      
Derivative, Notional Amount 500 $ 500  
Not Designated as Hedging Instrument | Foreign exchange      
Derivative [Line Items]      
Derivative, Notional Amount $ 2,900   $ 3,600