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Revenue Recognition - Contract Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]    
Contract assets - current $ 1,917 $ 1,931
Contract assets - noncurrent 6 11
Contract liabilities - current 2,211 2,160
Contract liabilities - noncurrent $ 253 $ 252