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Stock-Based Compensation Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pre-tax compensation expense $ 14 $ 19 $ 14
Deferred tax benefit 2 6 5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 5    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 7 months 6 days    
Intrinsic value of SSARs exercised $ 31 73 28
Fair value of shares vested [1] 20 6 8
Excess tax benefit from exercise / vesting of awards 7 $ 18 $ 9
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of shares vested $ 10    
[1] The fair value of shares vested in fiscal 2019 includes $10 related to a one-time performance-based special grant of restricted stock issued in fiscal 2014 to our Chief Executive Officer (who retired in fiscal 2019). During the performance period, dividends accrued and the award was adjusted for all applicable stock splits during the vesting period, subject to the same performance measures as the initial grant. The resulting shares vested on June 1, 2018.