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Acquisitions (Details) - USD ($)
$ in Millions
Dec. 01, 2020
Jul. 03, 2019
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Business Acquisition [Line Items]          
Goodwill     $ 779 $ 756 $ 753
The 86 Company [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired   100.00%      
Payments to Acquire Businesses, Gross   $ 22      
Goodwill   11      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets   12      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities   $ 1      
Part Time Rangers Holdings Limited          
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired 100.00%        
Payments to Acquire Businesses, Gross $ 14        
Goodwill 8        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets 8        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities $ 2