Borrowings (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions	6 Months Ended
	Jan. 28, 2017	Sep. 30, 2016	Jul. 30, 2016
Debt Instrument [Line Items]
Total	$ 34,650		$ 28,400
Unaccreted discount/issuance costs	(145)		(137)
Hedge accounting fair value adjustments	117		379
Total	34,622		28,642
Current portion of long-term debt	4,151		4,159
Long-term debt	30,471		24,483
Floating Rate Notes 3-month Libor Plus 0.28% Due March 2017
Debt Instrument [Line Items]
Amount	$ 1,000		$ 1,000
Effective Rate	1.29%		1.03%
Floating Rate Notes 3-month Libor Plus 0.60% Due February 2018
Debt Instrument [Line Items]
Amount	$ 1,000		$ 1,000
Effective Rate	1.58%		1.32%
Floating Rate Notes 3-month Libor Plus 0.31% Due June 2018
Debt Instrument [Line Items]
Amount	$ 900		$ 900
Effective Rate	1.34%		1.03%
Floating Rate Notes 3-month Libor Plus 0.50% Due March 2019
Debt Instrument [Line Items]
Amount	$ 500		$ 500
Effective Rate	1.49%		1.23%
Floating Rate Notes 3-month Libor Plus 0.34% Due September 2019
Debt Instrument [Line Items]
Amount	$ 500		$ 0
Effective Rate	1.38%		0.00%
Fixed-Rate Notes, 1.1%, Due March 2017
Debt Instrument [Line Items]
Interest rate, stated percentage	1.10%
Amount	$ 2,400		$ 2,400
Effective Rate	1.17%		0.87%
Fixed-Rate Notes, 3.15%, Due March 2017
Debt Instrument [Line Items]
Interest rate, stated percentage	3.15%
Amount	$ 750		$ 750
Effective Rate	1.52%		1.22%
Fixed Rate Notes, 1.4%, Due February 28, 2018
Debt Instrument [Line Items]
Interest rate, stated percentage	1.40%
Amount	$ 1,250		$ 1,250
Effective Rate	1.47%		1.47%
Fixed rate notes 1.65% due June 2018
Debt Instrument [Line Items]
Interest rate, stated percentage	1.65%
Amount	$ 1,600		$ 1,600
Effective Rate	1.72%		1.72%
Fixed-Rate Notes, 4.95%, Due February 2019
Debt Instrument [Line Items]
Interest rate, stated percentage	4.95%
Amount	$ 2,000		$ 2,000
Effective Rate	4.84%		4.76%
Fixed-Rate Notes, 1.60%, Due February 2019
Debt Instrument [Line Items]
Interest rate, stated percentage	1.60%
Amount	$ 1,000		$ 1,000
Effective Rate	1.67%		1.67%
Fixed-Rate Notes, 2.125%, Due March 2019
Debt Instrument [Line Items]
Interest rate, stated percentage	2.125%
Amount	$ 1,750		$ 1,750
Effective Rate	1.39%		1.08%
Fixed-Rate Notes, 1.40%, Due September 2019
Debt Instrument [Line Items]
Interest rate, stated percentage	1.40%
Amount	$ 1,500		$ 0
Effective Rate	1.48%		0.00%
Fixed-Rate Notes, 4.45%, Due January 2020
Debt Instrument [Line Items]
Interest rate, stated percentage	4.45%
Amount	$ 2,500		$ 2,500
Effective Rate	3.47%		3.25%
Fixed-Rate Notes, 2.45%, Due June 2020
Debt Instrument [Line Items]
Interest rate, stated percentage	2.45%
Amount	$ 1,500		$ 1,500
Effective Rate	2.54%		2.54%
Fixed-Rate Notes, 2.2%, Due February 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%
Amount	$ 2,500		$ 2,500
Effective Rate	2.30%		2.30%
Fixed-Rate Notes, 2.90%, Due March 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	2.90%
Amount	$ 500		$ 500
Effective Rate	1.55%		1.24%
Fixed-Rate Notes, 1.85%, Due September 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	1.85%
Amount	$ 2,000		$ 0
Effective Rate	1.90%		0.00%
Fixed-Rate Notes, 3.0 %, Due June 15, 2022
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%
Amount	$ 500		$ 500
Effective Rate	1.80%		1.51%
Fixed-Rate Notes, 2.6%, Due February, 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	2.60%
Amount	$ 500		$ 500
Effective Rate	2.68%		2.68%
Fixed-Rate Notes, 2.20%, Due September 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%
Amount	$ 750		$ 0
Effective Rate	2.27%		0.00%
Fixed-Rate Notes,3.625%, Due March 2024
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%
Amount	$ 1,000		$ 1,000
Effective Rate	1.66%		1.36%
Fixed-Rate Notes,3.5%, Due June 15, 2025
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
Amount	$ 500		$ 500
Effective Rate	1.96%		1.67%
Fixed-Rate Notes,2.95%, Due February, 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	2.95%
Amount	$ 750		$ 750
Effective Rate	3.01%		3.01%
Fixed-Rate Notes, 2.50%, Due September 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	2.50%
Amount	$ 1,500		$ 0
Effective Rate	2.55%		0.00%
Fixed-Rate Notes, 5.9%, Due February 2039
Debt Instrument [Line Items]
Interest rate, stated percentage	5.90%
Amount	$ 2,000		$ 2,000
Effective Rate	6.11%		6.11%
Fixed-Rate Notes, 5.5%, Due January 2040
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
Amount	$ 2,000		$ 2,000
Effective Rate	5.67%		5.67%
Aggregate debt issuance in February 2016
Debt Instrument [Line Items]
Amount		$ 6,250
One-month LIBOR plus | Floating Rate Notes 3-month Libor Plus 0.28% Due March 2017
Debt Instrument [Line Items]
Three-month LIBOR plus this Percentage	0.28%
One-month LIBOR plus | Floating Rate Notes 3-month Libor Plus 0.60% Due February 2018
Debt Instrument [Line Items]
Three-month LIBOR plus this Percentage	0.60%
One-month LIBOR plus | Floating Rate Notes 3-month Libor Plus 0.31% Due June 2018
Debt Instrument [Line Items]
Three-month LIBOR plus this Percentage	0.31%
One-month LIBOR plus | Floating Rate Notes 3-month Libor Plus 0.50% Due March 2019
Debt Instrument [Line Items]
Three-month LIBOR plus this Percentage	0.50%
One-month LIBOR plus | Floating Rate Notes 3-month Libor Plus 0.34% Due September 2019
Debt Instrument [Line Items]
Three-month LIBOR plus this Percentage	0.34%