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Derivatives and Foreign Exchange Risk Management, Fair Value Hedges (Details) (USD $) In Millions, unless otherwise specified							3 Months Ended
	Apr. 26, 2013 Interest Rate Swap	Jul. 26, 2013 Senior Notes 2010 Due 2015	Jul. 26, 2013 Senior Notes 2005 Due 2015	Jul. 26, 2013 Senior Notes 2011 Due 2016	Jul. 26, 2013 Senior Notes 2011 Due 2021	Jul. 26, 2013 Senior Notes 2012 Due 2022	Jul. 26, 2013 Fair Value Hedges [Member] Interest Rate Swap
Fair Value Hedges
Notional amount of interest rate fair value hedges	$ 2,625						$ 2,625
Interest rate derivatives hedged items							the Company’s $1.250 billion 3.000 percent 2010 Senior Notes due 2015, the $600 million 4.750 percent 2005 Senior Notes due 2015, the $500 million 2.625 percent 2011 Senior Notes due 2016, the $500 million 4.125 percent 2011 Senior Notes due 2021, and the $675 million 3.125 percent 2012 Senior Notes due 2022
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							89
Unrealized loss on interest rate fair value hedged items							$ 89