Borrowings (Schedule Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Oct. 25, 2014	Jul. 26, 2014
Debt Instrument [Line Items]
Total	$ 20,752	$ 20,754
Unaccreted discount	(62)	(63)
Hedge accounting fair value adjustments	275	210
Total	20,965	20,901
Current portion of long-term debt	1,350	500
Long-term debt	19,615	20,401
Floating Rate Notes 3-month Libor Plus 0.05% Due September 2015 [Member]
Debt Instrument [Line Items]
Maturity Date	Sep. 03, 2015	Sep. 03, 2015
Notes	850	850
Effective Rate	0.36%	0.35%
Debt Instrument, Basis Spread on Variable Rate	0.05%	0.05%
Floating Rate Notes 3-month Libor Plus 0.28% Due March 2017 [Member]
Debt Instrument [Line Items]
Maturity Date	Mar. 03, 2017	Mar. 03, 2017
Notes	1,000	1,000
Effective Rate	0.57%	0.56%
Debt Instrument, Basis Spread on Variable Rate	0.28%	0.28%
Floating rate notes 3-month Libor plus 0.5% due March 2019 [Member]
Debt Instrument [Line Items]
Maturity Date	Mar. 01, 2019	Mar. 01, 2019
Notes	500	500
Effective Rate	0.79%	0.78%
Debt Instrument, Basis Spread on Variable Rate	0.50%	0.50%
Fixed-Rate Notes, 2.90%, Due November 2014
Debt Instrument [Line Items]
Maturity Date	Nov. 17, 2014	Nov. 17, 2014
Notes	500	500
Debt Instrument, Interest Rate, Stated Percentage	2.90%	2.90%
Effective Rate	3.11%	3.11%
Fixed-Rate Notes, 5.5%, Due February 2016
Debt Instrument [Line Items]
Maturity Date	Feb. 22, 2016	Feb. 22, 2016
Notes	3,000	3,000
Debt Instrument, Interest Rate, Stated Percentage	5.50%	5.50%
Effective Rate	3.05%	3.04%
Fixed-Rate Notes, 1.1%, Due March 2017
Debt Instrument [Line Items]
Maturity Date	Mar. 03, 2017	Mar. 03, 2017
Notes	2,400	2,400
Debt Instrument, Interest Rate, Stated Percentage	1.10%	1.10%
Effective Rate	0.55%	0.56%
Fixed-Rate Notes, 3.15%, Due March 2017
Debt Instrument [Line Items]
Maturity Date	Mar. 14, 2017	Mar. 14, 2017
Notes	750	750
Debt Instrument, Interest Rate, Stated Percentage	3.15%	3.15%
Effective Rate	0.80%	0.79%
Fixed-Rate Notes, 4.95%, Due February 2019
Debt Instrument [Line Items]
Maturity Date	Feb. 15, 2019	Feb. 15, 2019
Notes	2,000	2,000
Debt Instrument, Interest Rate, Stated Percentage	4.95%	4.95%
Effective Rate	4.69%	4.69%
Fixed-Rate Notes, 2.125%, Due March 2019
Debt Instrument [Line Items]
Maturity Date	Mar. 01, 2019	Mar. 01, 2019
Notes	1,750	1,750
Debt Instrument, Interest Rate, Stated Percentage	2.125%	2.125%
Effective Rate	0.77%	0.77%
Fixed-Rate Notes, 4.45%, Due January 2020
Debt Instrument [Line Items]
Maturity Date	Jan. 15, 2020	Jan. 15, 2020
Notes	2,500	2,500
Debt Instrument, Interest Rate, Stated Percentage	4.45%	4.45%
Effective Rate	2.98%	2.98%
Fixed-Rate Notes, 2.90%, Due March 2021
Debt Instrument [Line Items]
Maturity Date	Mar. 04, 2021	Mar. 04, 2021
Notes	500	500
Debt Instrument, Interest Rate, Stated Percentage	2.90%	2.90%
Effective Rate	0.93%	0.93%
Fixed-Rate Notes,3.625%, Due March 2024
Debt Instrument [Line Items]
Maturity Date	Mar. 04, 2024	Mar. 04, 2024
Notes	1,000	1,000
Debt Instrument, Interest Rate, Stated Percentage	3.625%	3.625%
Effective Rate	1.04%	1.05%
Fixed-Rate Notes, 5.9%, Due February 2039
Debt Instrument [Line Items]
Maturity Date	Feb. 15, 2039	Feb. 15, 2039
Notes	2,000	2,000
Debt Instrument, Interest Rate, Stated Percentage	5.90%	5.90%
Effective Rate	6.11%	6.11%
Fixed-Rate Notes, 5.5%, Due January 2040
Debt Instrument [Line Items]
Maturity Date	Jan. 15, 2040	Jan. 15, 2040
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 [Line Items]
Other long-term debt	$ 2	$ 4
Effective Rate	2.08%	2.39%