Stockholders' Equity - Summary of Activities Related to Stock Repurchase Program (Detail) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended	150 Months Ended
	Oct. 30, 2015 USD ($) $ / shares shares	Oct. 30, 2015 USD ($) $ / shares shares
Equity [Abstract]
Number of shares repurchased | shares	19	233
Average price per share | $ / shares	$ 31.70	$ 33.33
Aggregate purchase price	$ 613
Remaining authorization at end of period	$ 1,847	$ 1,847