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Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Apr. 01, 2017
Apr. 02, 2016
Oct. 01, 2016
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     $ 189    
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a net liability position by counterparty $ 129   129   $ 86
Interest rate | Interest Expense          
Derivative [Line Items]          
Realized net benefits from derivative instruments 10 $ 26 22 $ 49  
Derivatives designated as hedges | Interest rate | Fair Value Hedging          
Derivative [Line Items]          
Derivative, Notional Amount 7,300   7,300   8,300
Derivatives designated as hedges | Foreign exchange | Cash Flow Hedging          
Derivative [Line Items]          
Derivative, Notional Amount 5,900   5,900   5,600
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 $ 3,600   $ 3,600   $ 3,300