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Revenue Recognition - Contract Balances (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
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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

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