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Retirement Plans (Schedule Of Retirement Plans Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic pension expense | $ 28 | $ 67 | $ 2
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | 29 | 30 | 24
Interest cost | 32 | 30 | 38
Expected return on plan assets | (74) | (72) | (68)
Net amortization and other | 14 | 17 | 6
Net periodic pension expense | 1 | 5 | 0
Defined contribution plans | 52 | 56 | 56
Total retirement plans expense | 53 | 61 | 56
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | 54 | 57 | 47
Interest cost | 94 | 125 | 155
Expected return on plan assets | (264) | (268) | (281)
Net amortization and other | 143 | 148 | 81
Net periodic pension expense | 27 | 62 | 2
Defined contribution plans | 114 | 112 | 125
Total retirement plans expense | $ 141 | $ 174 | $ 127

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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