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Acquisitions (Details) - USD ($)
$ in Millions
Dec. 01, 2020
Jan. 31, 2021
Apr. 30, 2020
Business Acquisition [Line Items]      
Goodwill   $ 774 $ 756
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 6    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets $ 8