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New Accounting Pronouncements (Details) - USD ($)	3 Months Ended
	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	$ 24,000,000
Increase (decrease) to diluted earnings per share (in dollars per share)	$ 0.02
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	$ (25,000,000)
Increase (decrease) to diluted earnings per share (in dollars per share)	$ (0.02)
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

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