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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Lessee, Lease, Description [Line Items]      
Operating Lease, Right-of-Use Asset $ 165 $ 232  
Finance lease, Right-of-Use-Asset 692 516  
Total lease assets 857 748  
Operating Lease, Liability, Noncurrent 122 171  
Finance Lease, Liability, Noncurrent 687 525  
Total lease liabilities 909 800  
Operating Lease, Cost 52 84  
Variable Lease, Cost 75 75  
Short-term Lease, Cost 12 7  
Finance Lease, Right-of-Use Asset, Amortization 51 15  
Finance Lease, Interest Expense 39 33  
Total finance lease costs 90 48  
Lease, Cost 229 214  
Operating Leases, Rent Expense     $ 97
Operating lease liability      
Lessee, Lease, Description [Line Items]      
Accounts Payable and Accrued Liabilities 40 63  
Finance lease liability      
Lessee, Lease, Description [Line Items]      
Accounts Payable and Accrued Liabilities $ 60 $ 41