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Revenue Recognition Contract balances (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities - current | $ (1,649) |  | $ (1,649) |  | $ (1,435)
Total contract balances, net | (264) |  | (264) |  | (181)
Contract with Customer, Liability, Revenue Recognized | 149 | $ 125 | 1,084 | $ 1,137 |
Accounts Receivable [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract assets - current | 1,553 |  | 1,553 |  | 1,395
Other Noncurrent Assets |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract assets - noncurrent | 95 |  | 95 |  | 104
Deferred Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities - current | (1,649) |  | (1,649) |  | (1,435)
Other Noncurrent Liabilities [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities - noncurrent | $ (263) |  | $ (263) |  | $ (245)

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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