Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 23, 2015	Jan. 24, 2014	Jan. 23, 2015	Jan. 24, 2014
Numerator:
Net earnings	$ 977	$ 762	$ 2,676	$ 2,617
Denominator
Basic weighted average shares outstanding (shares)	983.8	998.3	986.6	1,002.7
Effect of dilutive securities:
Employee stock options (shares)	8.0	7.8	7.6	7.1
Employee restricted stock units (shares)	3.9	3.8	4.2	4.1
Other (shares)	0.1	0.1	0.1	0.1
Diluted weighted average shares outstanding (shares)	995.8	1,010.0	998.5	1,014.0
Basic earnings per share:
Net earnings (usd per share)	$ 0.99	$ 0.76	$ 2.71	$ 2.61
Diluted earnings per share:
Net earnings (usd per share)	$ 0.98	$ 0.75	$ 2.68	$ 2.58
Stock Options
Diluted earnings per share:
Antidilutive securities excluded from computation of earnings per share (shares)	2	0	2	6