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Revenue Recognition Contract balances (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract with Customer, Liability, Current | $ (1,600) |  | $ (1,600) |  | $ (1,407)
Contract with Customer Asset Liability Net | (202) |  | (202) |  | (45)
Contract with Customer, Liability, Revenue Recognized | 326 | $ 214 | 1,012 | $ 926 |
Revenue, Remaining Performance Obligation, Amount | $ 14,400 |  | $ 14,400 |  |
Remaining Performance Obligations Expected as Revenue Over the Next Two Years | 60.00% |  | 60.00% |  |
Accounts Receivable [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract with Customer, Asset, Net, Current | $ 1,422 |  | $ 1,422 |  | 1,389
Other Noncurrent Assets |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract with Customer, Asset, Net, Noncurrent | 95 |  | 95 |  | 90
Other Noncurrent Liabilities [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract with Customer, Liability, Noncurrent | (119) |  | (119) |  | (117)
Deferred Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract with Customer, Liability, Current | $ (1,600) |  | $ (1,600) |  | $ (1,407)

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