Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Apr. 26, 2019	Jan. 25, 2019	Oct. 26, 2018	Jul. 27, 2018	Apr. 27, 2018	Jan. 26, 2018	Oct. 27, 2017	Jul. 28, 2017	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Numerator:
Net income attributable to ordinary shareholders	$ 1,172	$ 1,269	$ 1,115	$ 1,075	$ 1,460	$ (1,389)	$ 2,017	$ 1,016	$ 4,631	$ 3,104	$ 4,028
Denominator:
Basic - weighted average shares outstanding (in shares)									1,346.4	1,356.7	1,378.9
Effect of dilutive securities:
Employee stock options (in shares)									7.6	7.9	9.0
Employee restricted stock units (in shares)									3.2	3.3	3.4
Other (in shares)									0.3	0.3	0.1
Diluted – weighted average shares outstanding (in shares)									1,357.5	1,368.2	1,391.4
Basic earnings per share (in dollars per share)	$ 0.87	$ 0.95	$ 0.83	$ 0.79	$ 1.08	$ (1.03)	$ 1.49	$ 0.75	$ 3.44	$ 2.29	$ 2.92
Diluted earnings per share (in dollars per share)	$ 0.87	$ 0.94	$ 0.82	$ 0.79	$ 1.07	$ (1.03)	$ 1.48	$ 0.74	$ 3.41	$ 2.27	$ 2.89
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares excluded from computation of earnings per share (in shares)									7.0	10.0	7.0