New Accounting Pronouncements (Details) - USD ($)	3 Months Ended	6 Months Ended
	Oct. 27, 2017	Oct. 27, 2017	Jul. 28, 2017	Apr. 28, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle				$ 296,000,000
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to net income	$ 17,000,000	$ 41,000,000
Increase (decrease) to diluted earnings per share (in dollars per share)	$ 0.01	$ 0.03
Accounting Standards Update 2016-09 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle			$ 0
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to net income	$ 582,000,000	$ 557,000,000
Increase (decrease) to diluted earnings per share (in dollars per share)	$ 0.43	$ 0.41
Accounting Standards Update 2016-16 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle			$ 296,000,000