Derivatives and Foreign Exchange Risk Management, Fair Value Hedges (Details) (USD $) In Millions, unless otherwise specified							3 Months Ended
	Apr. 25, 2014 Interest Rate Swap	Jul. 25, 2014 Senior Notes 2010 Due 2015	Jul. 25, 2014 Senior Notes 2005 Due 2016	Jul. 25, 2014 Senior Notes 2011 Due 2016	Jul. 25, 2014 Senior Notes 2011 Due 2021	Jul. 25, 2014 Senior Notes 2012 Due 2022	Jul. 25, 2014 Fair Value Hedges [Member] Interest Rate Swap	Jul. 25, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap	Jul. 25, 2014 Designated as Hedging Instrument [Member] Fair Value Hedges [Member] Interest Rate Swap
Fair Value Hedges
Derivative, Notional Amount	$ 2,625							$ 250	$ 2,625
Interest rate derivatives hedged items							the Company’s $1.250 billion 3.000 percent 2010 Senior Notes classified as short-term borrowings, the $600 million 4.750 percent 2005 Senior Notes, the $500 million 2.625 percent 2011 Senior Notes, the $500 million 4.125 percent 2011 Senior Notes, and the $675 million 3.125 percent 2012 Senior Notes
Principal amount		1,250	600	500	500	675
Stated interest rate		3.00%	4.75%	2.625%	4.125%	3.125%
Unrealized gain on interest rate fair value hedging instruments							80
Unrealized loss on interest rate fair value hedged items							$ 80