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Stockholders' Equity - Activity Related to Stock Options (Detail)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Oct. 30, 2015
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance, Number of Shares 12
Options exercised, Number of Shares (1)
Options forfeited and expired, Number of Shares (2)
Ending balance, Number of Shares 9
Options vested and expected to vest, Number of Shares 9
Options Exercisable, Number of Shares 7
Weighted-Average Exercise Price  
Beginning balance, Weighted-Average Exercise Price | $ / shares $ 37.74
Options exercised, Weighted-Average Exercise Price | $ / shares 22.89
Options forfeited and expired, Weighted-Average Exercise Price | $ / shares 38.99
Ending balance, Weighted-Average Exercise Price | $ / shares 38.90
Options vested and expected to vest, Weighted-Average Exercise Price | $ / shares 38.95
Options Exercisable, Weighted-Average Exercise Price | $ / shares $ 39.54
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value  
Outstanding, Weighted-Average Remaining Contractual Term 2 years 10 months 10 days
Options vested and expected to vest, Weighted-Average Remaining Contractual Term 2 years 9 months 4 days
Exercisable, Weighted-Average Remaining Contractual Term 2 years 3 months 15 days
Outstanding, Aggregate Intrinsic Value | $ $ 12
Options vested and expected to vest, Aggregate Intrinsic Value | $ 12
Exercisable, Aggregate Intrinsic Value | $ $ 11