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Leases (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Leases [Abstract]      
Right-of-use assets obtained in exchange for operating lease liabilities $ 175 $ 74  
Other Noncurrent Assets      
Lessee, Lease, Description [Line Items]      
Operating lease, right-of-use asset 1,296   $ 1,190
Other Current Liabilities      
Lessee, Lease, Description [Line Items]      
Operating lease liabilities - current 326   332
Other Noncurrent Liabilities [Member]      
Lessee, Lease, Description [Line Items]      
Operating lease liabilities - noncurrent $ 972   $ 875