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Long-Term Debt Additional Details (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 226    
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,012    
Long-term Debt, Maturities, Repayments of Principal in Year Three 484    
Long-term Debt, Maturities, Repayments of Principal in Year Four 559    
Long-term Debt, Maturities, Repayments of Principal in Year Five 561    
Long-term Debt, Maturities, Repayments of Principal after Year Five 4,922    
Long-term Debt and Lease Obligation, Including Current Maturities 7,764 $ 7,822  
Interest Paid, Excluding Capitalized Interest, Operating Activities $ 242 $ 247 $ 369