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Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Jan. 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 $ 332    
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a net liability position by counterparty 34   $ 86
Interest rate | Interest Expense      
Derivative [Line Items]      
Realized net benefits from derivative instruments 12 $ 23  
Derivatives designated as hedges | Interest rate | Fair Value Hedging      
Derivative [Line Items]      
Derivative, Notional Amount 8,300   8,300
Derivatives designated as hedges | Foreign exchange | Cash Flow Hedging      
Derivative [Line Items]      
Derivative, Notional Amount 5,200   5,600
Not Designated as Hedging Instrument | Interest rate      
Derivative [Line Items]      
Derivative, Notional Amount 500    
Not Designated as Hedging Instrument | Foreign exchange      
Derivative [Line Items]      
Derivative, Notional Amount $ 3,500   $ 3,300