Borrowings (Schedule Of Long-Term Debt) (Detail) (USD $) In Millions, unless otherwise specified	Jan. 25, 2014	Jul. 27, 2013
Debt Instrument
Senior notes and other	$ 16,006	$ 16,021
Unaccreted discount	(62)	(65)
Hedge accounting fair value adjustments	193	245
Long-term Debt (Current & NonCurrent)	16,137	16,201
Less: Current portion of long-term debt	(3,752)	(3,273)
Total long-term debt	12,385	12,928
Floating-Rate Notes, Due 2014
Debt Instrument
Senior notes	1,250	1,250
Effective rate	0.58%	0.62%
1.625% Fixed-Rate Notes, Due 2014
Debt Instrument
Senior notes	2,000	2,000
Debt Instrument, Interest Rate, Stated Percentage	1.625%	1.625%
Effective rate	0.61%	0.64%
2.90% Fixed-Rate Notes, Due 2014
Debt Instrument
Senior notes	500	500
Debt Instrument, Interest Rate, Stated Percentage	2.90%	2.90%
Effective rate	3.11%	3.11%
5.50% Fixed-Rate Notes, Due 2016
Debt Instrument
Senior notes	3,000	3,000
Debt Instrument, Interest Rate, Stated Percentage	5.50%	5.50%
Effective rate	3.05%	3.07%
3.15% Fixed-Rate Notes, Due 2017
Debt Instrument
Senior notes	750	750
Debt Instrument, Interest Rate, Stated Percentage	3.15%	3.15%
Effective rate	0.81%	0.84%
4.95% Fixed-Rate Notes, Due 2019
Debt Instrument
Senior notes	2,000	2,000
Debt Instrument, Interest Rate, Stated Percentage	4.95%	4.95%
Effective rate	4.69%	4.70%
4.45% Fixed-Rate Notes, Due 2020
Debt Instrument
Senior notes	2,500	2,500
Debt Instrument, Interest Rate, Stated Percentage	4.45%	4.45%
Effective rate	3.37%	4.15%
5.90% Fixed-Rate Notes, Due 2039
Debt Instrument
Senior notes	2,000	2,000
Debt Instrument, Interest Rate, Stated Percentage	5.90%	5.90%
Effective rate	6.11%	6.11%
5.50% Fixed-Rate Notes, Due 2040
Debt Instrument
Senior notes	2,000	2,000
Debt Instrument, Interest Rate, Stated Percentage	5.50%	5.50%
Effective rate	5.67%	5.67%
Other Long-Term Debt
Debt Instrument
Other Long-term Debt	$ 6	$ 21
Effective rate	2.58%	1.46%