Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified																3 Months Ended	9 Months Ended			3 Months Ended
	Jan. 24, 2014	Apr. 26, 2013	Jan. 24, 2014 Senior Notes 2010 Due 2015	Jan. 24, 2014 Senior Notes 2005 Due 2016	Jan. 24, 2014 Senior Notes 2011 Due 2016	Jan. 24, 2014 Senior Notes 2013 Due 2018	Jan. 24, 2014 Senior Notes 2009 Due 2019	Jan. 24, 2014 Senior Notes 2010 Due 2020	Jan. 24, 2014 Senior Notes 2011 Due 2021	Jan. 24, 2014 Senior Notes 2012 Due 2022	Jan. 24, 2014 Senior Notes 2013 Due 2023	Jan. 24, 2014 Senior Notes 2009 Due 2039	Jan. 24, 2014 Senior Notes 2010 Due 2040	Jan. 24, 2014 Senior Notes 2012 Due 2042	Jan. 24, 2014 Senior Notes 2013 Due 2043	Jan. 24, 2014 Commercial Paper	Jan. 24, 2014 Commercial Paper	Apr. 26, 2013 Commercial Paper	Jan. 24, 2014 Credit Facility	Jan. 24, 2014 Credit Facility Line of Credit Facility 2017	Jan. 24, 2014 Bank Borrowings [Member]	Apr. 26, 2013 Bank Borrowings [Member]	Jan. 24, 2014 Senior Notes Senior Notes 2010 Due 2015	Apr. 26, 2013 Senior Notes Senior Notes 2010 Due 2015	Jan. 24, 2014 Senior Notes Senior Notes 2005 Due 2016	Apr. 26, 2013 Senior Notes Senior Notes 2005 Due 2016	Jan. 24, 2014 Senior Notes Senior Notes 2011 Due 2016	Apr. 26, 2013 Senior Notes Senior Notes 2011 Due 2016	Jan. 24, 2014 Senior Notes Senior Notes 2013 Due 2018	Apr. 26, 2013 Senior Notes Senior Notes 2013 Due 2018	Jan. 24, 2014 Senior Notes Senior Notes 2009 Due 2019	Apr. 26, 2013 Senior Notes Senior Notes 2009 Due 2019	Jan. 24, 2014 Senior Notes Senior Notes 2010 Due 2020	Apr. 26, 2013 Senior Notes Senior Notes 2010 Due 2020	Jan. 24, 2014 Senior Notes Senior Notes 2011 Due 2021	Apr. 26, 2013 Senior Notes Senior Notes 2011 Due 2021	Jan. 24, 2014 Senior Notes Senior Notes 2012 Due 2022	Apr. 26, 2013 Senior Notes Senior Notes 2012 Due 2022	Jan. 24, 2014 Senior Notes Senior Notes 2013 Due 2023	Apr. 26, 2013 Senior Notes Senior Notes 2013 Due 2023	Jan. 24, 2014 Senior Notes Senior Notes 2009 Due 2039	Apr. 26, 2013 Senior Notes Senior Notes 2009 Due 2039	Jan. 24, 2014 Senior Notes Senior Notes 2010 Due 2040	Apr. 26, 2013 Senior Notes Senior Notes 2010 Due 2040	Jan. 24, 2014 Senior Notes Senior Notes 2012 Due 2042	Apr. 26, 2013 Senior Notes Senior Notes 2012 Due 2042	Jan. 24, 2014 Senior Notes Senior Notes 2013 Due 2043	Apr. 26, 2013 Senior Notes Senior Notes 2013 Due 2043	Jan. 24, 2014 Interest Rate Swap	Apr. 26, 2013 Interest Rate Swap	Jan. 24, 2014 Capital Lease Obligations	Apr. 26, 2013 Capital Lease Obligations	Jan. 24, 2014 Debt Instrument, Unamortized Debt Discount [Member]	Jan. 24, 2014 Long-term Debt [Member]	Apr. 26, 2013 Long-term Debt [Member]	Feb. 28, 2014 Subsequent Event [Member] Senior Notes Senior Notes 2014	Feb. 28, 2014 Subsequent Event [Member] Senior Notes Senior Notes 2014 Due 2017 Floating	Feb. 28, 2014 Subsequent Event [Member] Senior Notes Senior Notes 2014 Due 2017	Feb. 28, 2014 Subsequent Event [Member] Senior Notes Senior Notes 2014 Due 2024	Feb. 28, 2014 Subsequent Event [Member] Senior Notes Senior Notes 2014 Due 2044
Debt [Line Items]
Debt Instrument, Maturity Date, Year, Earliest																																																	2015		2015		2018
Debt Instrument, Maturity Date, Year, Last																																																	2022		2025		2043
Debt Instrument, Maturity Date, Year																					2015		2015		2016		2016		2018		2019		2020		2021		2022		2023		2039		2040		2042		2043
Line of Credit Facility
Maximum credit available																				$ 2,250
Maximum maturities																364 days
Short-term borrowings	2,618	910														1,710	1,710	125
Weighted average original maturity																83 days	52 days
Weighted average interest rate																0.11%	0.10%
Additional borrowing capacity																			750
Line of Credit Facility, Length of Extension																				1 year
General Disclosures
Principal amount			1,250	600	500				500	675						2,250	2,250																																							2,000	250	250	850	650
Long-term debt	9,601	9,741																			3	3	1,250	1,250	600	600	500	500	1,000	1,000	400	400	1,250	1,250	500	500	675	675	1,250	1,250	300	300	500	500	400	400	750	750	73	181	141	152
Debt Instrument, Unamortized Discount																																																						(19)	(20)
Gains from interest rate swap terminations	$ 28	$ 50
Stated interest rate			3.00%	4.75%	2.625%	1.375%	5.60%	4.45%	4.125%	3.125%	2.75%	6.50%	5.55%	4.50%	4.00%																																											0.875%	3.625%	4.625%