Derivative Financial Instruments and Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
	Jul. 28, 2013	Apr. 28, 2013	Jul. 28, 2013 Foreign Exchange Forward	Jul. 28, 2013 Foreign exchange contracts	Jan. 25, 2012 Interest Rate Swap	Jul. 28, 2013 Interest Rate Swap
Derivative [Line Items]
Notional amount of foreign currency derivatives	$ 1,470	$ 873
Notional amount of interest rate derivatives	9,000	160
Notional amount of cross currency interest rate swap		316
Period of Hedging Forecasted Transactions	2 years
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	7.3
Notional Amount of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	752.6	369.9
Unrealized Gain (Loss) related to Outstanding Nondesignated Derivative Instruments	(13.0)	(4.0)
Derivative, Gain (Loss) on Derivative, Net				6.2
Derivative, Term			1 year		3 years
Notional Amount of Interest Rate Derivative Instruments Not Designated as Hedging Instruments						119
Debt Instrument, Face Amount	$ 119