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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended | 15 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Tax benefit from restructuring foreign subsidiary | $ 13 | $ 103 | $ 74 |
Payroll tax deferral from CARES Act |  |  |  | $ 73
Non-U.S. tax holiday tax rate reductions for certain foreign jurisdictions, expiration period in years | 1 year |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 50 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 185 |  |  |
Unrecognized tax benefits, income tax penalties and interest expense | (4) | 1 | 4 |
Unrecognized tax benefits, income tax penalties and interest accrued | 24 | 29 |  |
Income taxes paid | $ 680 | $ 400 | $ 650 |
Amount of net operating losses and tax credits expiring over the next 10 years | Approximately half |  |  |
Net operating losses and tax credits, remaining to expire over next 10 years | $ 316 |  |  |

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- Definition Deferred Tax Assets Net Operating Losses And Tax Credits, Remaining to Expire Over Next 9 Years + References No definition available. + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4297-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 + Details
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