Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 28, 2011	Oct. 29, 2010	Oct. 28, 2011	Oct. 29, 2010
Earnings Per Share Reconciliation
Net earnings	$ 871	$ 566	$ 1,692	$ 1,396
Basic weighted average shares outstanding	1,058.1	1,080.1	1,060.6	1,083.1
Effect of dilutive securities:
Employee stock options	0.2	0.3	0.7	0.5
Employee resticted stock awards/units	4.6	3.1	4.7	2.9
Other	0.2	0.2	0.2	0.2
Diluted weighted average shares outstanding	1,063.1	1,083.7	1,066.2	1,086.7
Basic earnings per share	$ 0.82	$ 0.52	$ 1.60	$ 1.29
Diluted earnings per share	$ 0.82	$ 0.52	$ 1.59	$ 1.28
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares excluded from computation of earnings per share	63	69	53	62