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Leases Lease Costs (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
Units
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Units
Jun. 30, 2019
USD ($)
Leases [Abstract]        
Maximum lease term | Units 27   27  
Minimum lease term | Units 1   1  
Operating Leases, Rent Expense   $ 18   $ 54
Operating Lease, Cost $ 26   $ 65  
Variable Lease, Cost 26   52  
Short-term Lease, Cost 2   5  
Finance lease, amortization expense 2   7  
Finance Lease, Interest Expense 9   24  
Finance lease expenses 11   31  
Lease, Cost $ 65   $ 153  
Operating Lease, Weighted Average Remaining Lease Term 4 years   4 years  
Finance Lease, Weighted Average Remaining Lease Term 12 years   12 years  
Operating Lease, Weighted Average Discount Rate, Percent 1.60%   1.60%  
Finance Lease, Weighted Average Discount Rate, Percent 35.10%   35.10%