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Revenue Recognition - Contract Balances (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]    
Contract assets - current $ 1,961 $ 2,370
Contract assets - noncurrent 9 12
Contract liabilities - current 2,143 1,996
Contract liabilities - noncurrent $ 314 $ 297