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Segment Information - Long-Lived Assets and Revenue by Geographical Areas (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]      
Revenues $ 4,463 $ 4,475 $ 4,005
Long-lived Assets 331 300  
Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 4,463 4,475 4,005
Long-lived Assets 604 300  
United States | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 1,934 1,956 1,754
Long-lived Assets 426 201  
United Kingdom | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 551 596 593
Long-lived Assets 49 20  
All other territories | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 1,978 1,923 $ 1,658
Long-lived Assets $ 129 $ 79