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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Oct. 01, 2019
Lessee, Lease, Description [Line Items]        
Operating Lease, Right-of-Use Asset $ 232 $ 0   $ 205
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 516      
Total lease assets 748      
Accounts Payable and Accrued Liabilities   1    
Operating Lease, Liability, Noncurrent 171      
Finance Lease, Liability, Noncurrent 525      
Total lease liabilities 800      
Operating Lease, Cost 84      
Variable Lease, Cost 75      
Short-term Lease, Cost 7      
Finance Lease, Right-of-Use Asset, Amortization 15      
Finance Lease, Interest Expense 33      
Total finance lease costs 48      
Lease, Cost 214      
Operating Leases, Rent Expense   97 $ 92  
Operating Lease, Liability   $ 210    
Operating lease liability        
Lessee, Lease, Description [Line Items]        
Accounts Payable and Accrued Liabilities 63      
Finance lease liability        
Lessee, Lease, Description [Line Items]        
Accounts Payable and Accrued Liabilities $ 41