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Condensed Consolidated Financial Statements (Details) - USD ($)
$ in Millions
 9 Months Ended
Jan. 31, 2017
May 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Excess Tax Benefits from Stock Based Compensation $ 4  
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