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Acquisition of Business (Details) - USD ($)
$ in Millions
Jul. 03, 2019
Jan. 31, 2020
Apr. 30, 2019
Business Acquisition [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 100.00%    
Goodwill   $ 765 $ 753
The 86 Company [Member]      
Business Acquisition [Line Items]      
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