Derivatives and Foreign Exchange Risk Management, Freestanding Derivative Forward Contracts and Cash Flow Hedges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended
	Jul. 25, 2014	Apr. 25, 2014	Jul. 25, 2014 Foreign Currency Exchange Rate Contracts	Apr. 25, 2014 Foreign Currency Exchange Rate Contracts	Jul. 25, 2014 Interest Rate Swap	Apr. 25, 2014 Interest Rate Swap	Jul. 25, 2014 Other Expense, Net Foreign Currency Exchange Rate Contracts	Jul. 26, 2013 Other Expense, Net Foreign Currency Exchange Rate Contracts	Jul. 25, 2014 Cash Flow Hedging [Member]	Jul. 26, 2013 Cash Flow Hedging [Member]	Jul. 25, 2014 Cash Flow Hedging [Member] Foreign Currency Exchange Rate Contracts	Jul. 26, 2013 Cash Flow Hedging [Member] Foreign Currency Exchange Rate Contracts	Jul. 25, 2014 Cash Flow Hedging [Member] Other Expense, Net Foreign Currency Exchange Rate Contracts	Jul. 26, 2013 Cash Flow Hedging [Member] Other Expense, Net Foreign Currency Exchange Rate Contracts	Jul. 25, 2014 Cash Flow Hedging [Member] Interest Expense Interest Rate Swap	Jul. 26, 2013 Cash Flow Hedging [Member] Interest Expense Interest Rate Swap	Jul. 25, 2014 Cash Flow Hedging [Member] Cost of Products Sold Foreign Currency Exchange Rate Contracts	Jul. 26, 2013 Cash Flow Hedging [Member] Cost of Products Sold Foreign Currency Exchange Rate Contracts	Jul. 25, 2014 Not Designated as Hedging Instrument [Member] Foreign Currency Exchange Rate Contracts	Apr. 25, 2014 Not Designated as Hedging Instrument [Member] Foreign Currency Exchange Rate Contracts	Jul. 25, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Currency Exchange Rate Contracts	Apr. 25, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Foreign Currency Exchange Rate Contracts	Jul. 25, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount			$ 7,306	$ 8,051		$ 2,625													$ 1,985	$ 2,202	$ 5,321	$ 5,849	$ 250
Freestanding Derivative Forward Contracts
Gain (loss) on foreign currency derivatives not designated as hedging instruments							(24)	29
Cash Flow Hedges
Maximum remaining maturity of foreign currency derivatives									3 years
Gains/(losses) recognized in OCI on effective portion of derivative									62	(27)	62	(27)
Effective portion of gains/(losses) on derivative reclassified from AOCI into income									(1)	17			2	32	2	2	(3)	(15)
Weighted average fixed rate of interest rate derivatives					2.83%
Unrealized gain (loss) associated with cash flow hedging instruments						7
After-tax net unrealized (losses)/gains associated with cash flow hedging instruments recorded in AOCI	(7)	(44)
Cash flow hedge unrealized gains to be reclassified over the next 12 months	$ 6