Derivative Instruments - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Sep. 29, 2018
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	$ 147
Aggregate fair value of derivative instruments with credit-risk-related contingent features in a net liability position by counterparty	267	$ 299
Derivatives designated as hedges | Interest rate | Fair Value Hedging
Derivative [Line Items]
Derivative, Notional Amount	7,500	7,600
Derivatives designated as hedges | Foreign exchange | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount	6,100	6,200
Not Designated as Hedging Instrument | Interest rate
Derivative [Line Items]
Derivative, Notional Amount	2,000
Not Designated as Hedging Instrument | Foreign exchange
Derivative [Line Items]
Derivative, Notional Amount	$ 2,400	$ 3,300