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Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |
Period over which the amount of unrecognized tax benefits are not expected to significantly increase or decrease | 12 months |
Unrecognized tax benefits, beginning | $ 195 | $ 159
Additions for current year tax positions | 27 | 25
Additions for prior year tax positions | 17 | 29
Reductions for prior year tax positions | (6) | (8)
Acquisitions and divestitures | 1 | 0
Reductions for settlements with tax authorities | (5) | 0
Reductions for expiration of statutes of limitations | (10) | (10)
Unrecognized tax benefits, ending | $ 219 | $ 195

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- Definition Unrecognized tax benefits, increase (decrease) resulting from acquisition/divestiture + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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