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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Lessee, Lease, Description [Line Items]      
Operating Lease, Right-of-Use Asset $ 155 $ 165  
Finance lease, Right-of-Use-Asset 630 692  
Total lease assets 785 857  
Operating Lease, Liability, Noncurrent 93 122  
Finance Lease, Liability, Noncurrent 628 687  
Total lease liabilities 839 909  
Operating Lease, Cost 56 52 $ 84
Variable Lease, Cost 78 75 75
Short-term Lease, Cost 26 12 7
Finance Lease, Right-of-Use Asset, Amortization 58 51 15
Finance Lease, Interest Expense 42 39 33
Total finance lease costs 100 90 48
Lease, Cost 260 229 $ 214
Derivative, Notional Amount 1,500    
Operating lease liability      
Lessee, Lease, Description [Line Items]      
Accounts Payable and Accrued Liabilities 59 40  
Finance lease liability      
Lessee, Lease, Description [Line Items]      
Accounts Payable and Accrued Liabilities $ 59 $ 60