Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jan. 29, 2016	Jan. 23, 2015	Jan. 29, 2016	Jan. 23, 2015
Numerator:
Net income attributable to ordinary shareholders	$ 1,095	$ 977	$ 2,435	$ 2,676
Denominator:
Basic weighted average shares outstanding (shares)	1,406.6	983.8	1,412.5	986.6
Effect of dilutive securities:
Employee stock options (shares)	12.0	8.0	12.5	7.6
Employee restricted stock units (shares)	3.5	3.9	4.1	4.2
Other (shares)	0.1	0.1	0.1	0.1
Diluted weighted average shares outstanding (shares)	1,422.2	995.8	1,429.2	998.5
Basic earnings per share (usd per share)	$ 0.78	$ 0.99	$ 1.72	$ 2.71
Diluted earnings per share (usd per share)	$ 0.77	$ 0.98	$ 1.70	$ 2.68
Stock options and restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	21.0		21.0
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	5.0	2.0	4.0	2.0
Restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)		1.0		1.0