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Acquisitions, Disposals and Other Transactions (Fiscal 2019) (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
May 31, 2019
Sep. 30, 2018
The Stars Group    
Investment Holdings [Line Items]    
Payments to acquire investments $ 236  
Percentage of ownership of equity interest 4.99%  
Transfer restrictions period 2 years  
The Stars Group's U.S. business    
Investment Holdings [Line Items]    
Percentage of ownership interest that can be acquired in the future 50.00%  
Caffeine and Caffeine Studios    
Investment Holdings [Line Items]    
Payments to acquire investments   $ 100