Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Oct. 26, 2012		Oct. 28, 2011		Oct. 26, 2012		Oct. 28, 2011
Numerator:
Earnings from continuing operations	$ 646		$ 864		$ 1,510		$ 1,683
Earnings from discontinued operations	0		7		0		9
Net earnings	$ 646		$ 871		$ 1,510		$ 1,692
Denominator
Basic - weighted average shares outstanding	1,019.4		1,058.1		1,024.4		1,060.6
Effect of dilutive securities:
Employee stock options	2.7		0.2		2.1		0.7
Employee restricted stock units	5.6		4.6		5.6		4.7
Other	0.1		0.2		0.1		0.2
Diluted - weighted average shares outstanding	1,027.8		1,063.1		1,032.2		1,066.2
Basic earnings per share:
Earnings from continuing operations	$ 0.63		$ 0.82		$ 1.47		$ 1.59
Earnings from discontinued operations	$ 0		$ 0.01		$ 0		$ 0.01
Net earnings	$ 0.63	[1]	$ 0.82	[1]	$ 1.47	[1]	$ 1.60	[1]
Diluted earnings per share:
Earnings from continuing operations	$ 0.63		$ 0.81		$ 1.46		$ 1.58
Earnings from discontinued operations	$ 0		$ 0.01		$ 0		$ 0.01
Net earnings	$ 0.63		$ 0.82		$ 1.46		$ 1.59
Stock Options
Diluted earnings per share:
Number of shares excluded from computation of earnings per share	41		63		41		53

[1] All earnings per share amounts have been rounded to the nearest $0.01, and therefore, may not sum.