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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Apr. 28, 2017	Jan. 27, 2017	Oct. 28, 2016	Jul. 29, 2016	Apr. 29, 2016	Jan. 29, 2016	Oct. 30, 2015	Jul. 31, 2015	Apr. 28, 2017	Apr. 29, 2016	Apr. 24, 2015
Numerator:
Net income attributable to ordinary shareholders	$ 1,163	$ 821	$ 1,115	$ 929	$ 1,104	$ 1,095	$ 520	$ 820	$ 4,028	$ 3,538	$ 2,675
Denominator:
Basic weighted average shares outstanding (shares)									1,378.9	1,409.6	1,095.5
Effect of dilutive securities:
Employee stock options (shares)									9.0	12.2	9.1
Employee restricted stock units (shares)									3.4	4.0	4.3
Other (shares)									0.1	0.1	0.1
Diluted – weighted average shares outstanding (in shares)									1,391.4	1,425.9	1,109.0
Basic earnings per share (in dollars per share)	$ 0.85	$ 0.60	$ 0.81	$ 0.67	$ 0.79	$ 0.78	$ 0.37	$ 0.58	$ 2.92	$ 2.51	$ 2.44
Diluted earnings per share (in dollars per share)	$ 0.84	$ 0.59	$ 0.80	$ 0.66	$ 0.78	$ 0.77	$ 0.36	$ 0.57	$ 2.89	$ 2.48	$ 2.41
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares excluded from computation of earnings per share (shares)									7.0	4.0	2.0

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