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Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
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     $ 73    
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a net liability position by counterparty $ 324   324   $ 217
Interest rate | Interest Expense          
Derivative [Line Items]          
Realized net benefits from derivative instruments 9 $ 7 3 $ 29  
Derivatives designated as hedges | Interest rate | Fair Value Hedging          
Derivative [Line Items]          
Derivative, Notional Amount 7,800   7,800   8,200
Derivatives designated as hedges | Foreign exchange | Cash Flow Hedging          
Derivative [Line Items]          
Derivative, Notional Amount 6,100   6,100   6,300
Not Designated as Hedging Instrument | Interest rate          
Derivative [Line Items]          
Derivative, Notional Amount 2,000   2,000    
Not Designated as Hedging Instrument | Foreign exchange          
Derivative [Line Items]          
Derivative, Notional Amount $ 2,800   $ 2,800   $ 3,600