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Leases (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Lessee, Lease, Description [Line Items]      
Right-of-use assets obtained in exchange for operating lease liabilities $ 152 $ 303  
Other Noncurrent Assets      
Lessee, Lease, Description [Line Items]      
Operating lease, right-of-use asset 1,072   $ 1,376
Other Current Liabilities      
Lessee, Lease, Description [Line Items]      
Operating lease liabilities - current 253   319
Other Noncurrent Liabilities [Member]      
Lessee, Lease, Description [Line Items]      
Operating lease liabilities - noncurrent $ 813   $ 1,055