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Condensed Consolidated Financial Statements (Details) - USD ($)
$ in Millions
 6 Months Ended
Oct. 31, 2016
May 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Excess Tax Benefits from Stock Based Compensation $ 3  
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 10
Retained Earnings [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 10