Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 27, 2012	Jan. 28, 2011	Jan. 27, 2012	Jan. 28, 2011
Earnings Per Share Reconciliation
Earnings from continuing operations	$ 845	$ 913	$ 2,527	$ 2,294
Net earnings	$ 935	$ 924	$ 2,626	$ 2,320
Basic weighted average shares outstanding	1,054.4	1,073.9	1,058.5	1,079.8
Effect of dilutive securities:
Employee stock options	0.8	0.4	0.7	0.4
Employee resticted stock awards/units	4.8	3.4	4.7	3.1
Other	0.2	0.2	0.2	0.2
Diluted weighted average shares outstanding	1,060.2	1,077.9	1,064.1	1,083.5
Basic earnings per share:
Earnings from continuing operations (per share)	$ 0.80	$ 0.85	$ 2.39	$ 2.12
Net earnings (per share)	$ 0.89	$ 0.86	$ 2.48	$ 2.15
Diluted earnings per share:
Earnings from continuing operations (per share)	$ 0.80	$ 0.85	$ 2.37	$ 2.12
Net earnings (per share)	$ 0.88	$ 0.86	$ 2.47	$ 2.14
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares excluded from computation of earnings per share	53	66	53	62