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Revenue Recognition Contract balances (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities - current | $ (1,971) |  | $ (1,971) |  | $ (1,637)
Contract with Customer, Liability, Revenue Recognized | 308 | $ 221 | 1,059 | $ 935 |
Accounts Receivable [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract assets - current | 1,851 |  | 1,851 |  | 1,718
Other Noncurrent Assets |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract assets - noncurrent | 90 |  | 90 |  | 99
Deferred Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities - current | (1,971) |  | (1,971) |  | (1,637)
Other Noncurrent Liabilities [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities - noncurrent | $ (285) |  | $ (285) |  | $ (269)

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