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Commitments and Contingencies Commitments and Contingencies - Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Leases      
Operating lease expense $ 92 $ 90 $ 86
2018 49    
CT and QTE outstanding leaseback obligation 301 $ 338  
2018 51    
2018 69    
2019 64    
2020 62    
2021 47    
2022 7    
Thereafter 1    
Total 250    
2019 51    
2020 51    
2021 51    
2022 51    
Thereafter 468    
Total 723    
Less: amount representing interest (541)    
Total 182    
2019 50    
2020 207    
2021 25    
2022 0    
Thereafter 0    
Total $ 331