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Revenue Recognition - Contract Balances (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Contract liabilities - current | $ 2,122 | $ 1,996
Accounts receivable - net |  |
Disaggregation of Revenue [Line Items] |  |
Contract assets - current | 2,170 | 2,370
Other noncurrent assets |  |
Disaggregation of Revenue [Line Items] |  |
Contract assets - noncurrent | 4 | 12
Deferred revenue |  |
Disaggregation of Revenue [Line Items] |  |
Contract liabilities - current | 2,122 | 1,996
Other noncurrent liabilities |  |
Disaggregation of Revenue [Line Items] |  |
Contract liabilities - noncurrent | $ 306 | $ 297

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