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Retirement Plans Accumulated Benefit Obligations and Reconciliations of Changes in Projected Benefit Obligation, Changes in Plan Assets and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Pension Plan | Foreign Plan |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Accumulated Benefit Obligation |  | $ 2,540 | $ 2,627 |
Change in Projected Benefit Obligation |  |  |  |
Projected benefit obligation at beginning of year |  | 2,726 | 2,652 |
Service cost |  | 27 | 25 | $ 22
Interest cost |  | 32 | 36 | 54
Plan participant contributions |  | 3 | 3 |
Actuarial (gain) loss |  | (103) | 7 |
Amendments made during the year |  | (6) | 0 |
Estimated subsidy received |  | 0 | 0 |
Curtailment |  | (3) | (8) |
Other |  | (2) | 4 |
Currency translation adjustment |  | 75 | 118 |
Projected benefit obligation at end of year |  | 2,625 | 2,726 | 2,652
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 2,213 | 2,098 |
Actual return on plan assets |  | 125 | 75 |
Employer and employee contributions |  | 65 | 56 |
Benefits paid |  | (79) | (73) |
Settlement payments |  | (45) | (36) |
Other |  | (1) | 0 |
Currency translation adjustment |  | 66 | 93 |
Fair value of plan assets at end of year |  | 2,344 | 2,213 | 2,098
Funded status |  | (281) | (513) |
Net amount recognized |  | $ (281) | $ (513) |
Weighted Average Assumptions |  |  |  |
Discount rate | [1] | 1.80% | 1.35% |
Rate of compensation increase |  | 2.85% | 2.75% |
Interest Crediting Rate |  | 1.45% | 1.50% |
Defined Benefit Plan, Total Plan Assets |  | $ 2,344 | $ 2,213 |
Pension Plan | United States |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Accumulated Benefit Obligation |  | 2,629 | 3,217 |
Change in Projected Benefit Obligation |  |  |  |
Projected benefit obligation at beginning of year |  | 3,217 | 3,115 |
Service cost |  | 0 | 0 | 8
Interest cost |  | 47 | 67 | 108
Plan participant contributions |  | 0 | 0 |
Actuarial (gain) loss |  | (52) | 298 |
Amendments made during the year |  | 0 | 0 |
Estimated subsidy received |  | 0 | 0 |
Curtailment |  | 0 | 0 |
Other |  | 0 | 0 |
Currency translation adjustment |  | 0 | 0 |
Projected benefit obligation at end of year |  | 2,629 | 3,217 | 3,115
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 2,706 | 2,736 |
Actual return on plan assets |  | 333 | 228 |
Employer and employee contributions |  | 3 | 5 |
Benefits paid |  | (108) | (112) |
Settlement payments |  | (475) | (151) |
Other |  | 0 | 0 |
Currency translation adjustment |  | 0 | 0 |
Fair value of plan assets at end of year |  | 2,459 | 2,706 | 2,736
Funded status |  | (170) | (511) |
Net amount recognized |  | $ (170) | $ (511) |
Weighted Average Assumptions |  |  |  |
Discount rate | [1] | 2.50% | 2.25% |
Defined Benefit Plan, Total Plan Assets |  | $ 2,459 | $ 2,706 |
Pension Plan | Fair Value, Inputs, Level 1 | Foreign Plan |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 665 |  |
Fair value of plan assets at end of year |  | 615 | 665 |
Pension Plan | Fair Value, Inputs, Level 1 | United States |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 2,251 |  |
Fair value of plan assets at end of year |  | 1,993 | 2,251 |
Pension Plan | Fair Value, Inputs, Level 2 [Member] | Foreign Plan |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 1,532 |  |
Fair value of plan assets at end of year |  | 1,624 | 1,532 |
Pension Plan | Fair Value, Inputs, Level 2 [Member] | United States |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 259 |  |
Fair value of plan assets at end of year |  | 263 | 259 |
Postretirement Benefits |  |  |  |
Retirement Plans [Line Items] |  |  |  |
Accumulated Benefit Obligation |  | 0 | 0 |
Change in Projected Benefit Obligation |  |  |  |
Projected benefit obligation at beginning of year |  | 146 | 174 |
Service cost |  | 1 | 1 | 1
Interest cost |  | 2 | 4 | 6
Plan participant contributions |  | 3 | 4 |
Actuarial (gain) loss |  | (13) | (3) |
Amendments made during the year |  | 0 | (13) |
Estimated subsidy received |  | 0 | 1 |
Curtailment |  | 0 | 0 |
Other |  | 0 | 0 |
Currency translation adjustment |  | 1 | (1) |
Projected benefit obligation at end of year |  | 123 | 146 | 174
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 153 | 163 |
Actual return on plan assets |  | 30 | 4 |
Employer and employee contributions |  | 6 | 7 |
Benefits paid |  | (17) | (21) |
Settlement payments |  | 0 | 0 |
Other |  | 0 | 0 |
Currency translation adjustment |  | 0 | 0 |
Fair value of plan assets at end of year |  | 172 | 153 | $ 163
Funded status |  | 49 | 7 |
Net amount recognized |  | $ 49 | $ 7 |
Weighted Average Assumptions |  |  |  |
Discount rate | [1] | 2.30% | 1.90% |
Defined Benefit Plan, Total Plan Assets |  | $ 172 | $ 153 |
Postretirement Benefits | Fair Value, Inputs, Level 1 |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 5 |  |
Fair value of plan assets at end of year |  | 5 | 5 |
Postretirement Benefits | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 148 |  |
Fair value of plan assets at end of year |  | 167 | 148 |
Other noncurrent assets | Pension Plan | Foreign Plan |  |  |  |
Change in Projected Benefit Obligation |  |  |  |
Benefits and settlements paid |  | (124) | (109) |
Other noncurrent assets | Pension Plan | United States |  |  |  |
Change in Projected Benefit Obligation |  |  |  |
Benefits and settlements paid |  | (583) | (263) |
Other noncurrent assets | Postretirement Benefits |  |  |  |
Change in Projected Benefit Obligation |  |  |  |
Benefits and settlements paid |  | (17) | (21) |
Business Divestitures, Not Specific | Pension Plan | Foreign Plan |  |  |  |
Change in Projected Benefit Obligation |  |  |  |
Power Solutions divestiture |  | 0 | (2) |
Business Divestitures, Not Specific | Pension Plan | United States |  |  |  |
Change in Projected Benefit Obligation |  |  |  |
Power Solutions divestiture |  | 0 | 0 |
Business Divestitures, Not Specific | Postretirement Benefits |  |  |  |
Change in Projected Benefit Obligation |  |  |  |
Power Solutions divestiture |  | 0 | 0 |
Hedge Funds | Pension Plan | Fair Value, Inputs, Level 1 | Foreign Plan |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
Hedge Funds | Pension Plan | Fair Value, Inputs, Level 2 [Member] | Foreign Plan |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 49 |  |
Fair value of plan assets at end of year |  | 27 | 49 |
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 1 | Foreign Plan |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 178 |  |
Fair value of plan assets at end of year |  | 151 | 178 |
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 1 | United States |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 2 [Member] | Foreign Plan |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 2 [Member] | United States |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 36 |  |
Fair value of plan assets at end of year |  | 75 | 36 |
Cash and cash equivalents | Postretirement Benefits |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 5 |  |
Fair value of plan assets at end of year |  | 5 | 5 |
Cash and cash equivalents | Postretirement Benefits | Fair Value, Inputs, Level 1 |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 5 |  |
Fair value of plan assets at end of year |  | 5 | 5 |
Cash and cash equivalents | Postretirement Benefits | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
Commodities | Postretirement Benefits |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 12 |  |
Fair value of plan assets at end of year |  | 17 | 12 |
Commodities | Postretirement Benefits | Fair Value, Inputs, Level 1 |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 0 |  |
Fair value of plan assets at end of year |  | 0 | 0 |
Commodities | Postretirement Benefits | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in Plan Assets |  |  |  |
Fair value of plan assets at beginning of year |  | 12 |  |
Fair value of plan assets at end of year |  | 17 | 12 |
Continuing Operations [Member] | Pension Plan | Foreign Plan |  |  |  |
Change in Projected Benefit Obligation |  |  |  |
Service cost |  | 27 | 25 |
Interest cost |  | 32 | 36 |
Change in Plan Assets |  |  |  |
Prepaid benefit cost |  | 79 | 29 |
Accrued benefit liability |  | (360) | (542) |
Continuing Operations [Member] | Pension Plan | United States |  |  |  |
Change in Plan Assets |  |  |  |
Prepaid benefit cost |  | 44 | 32 |
Accrued benefit liability |  | (214) | (543) |
Continuing Operations [Member] | Postretirement Benefits |  |  |  |
Change in Plan Assets |  |  |  |
Prepaid benefit cost |  | 107 | 78 |
Accrued benefit liability |  | $ (58) | $ (71) |
[1] | The Company considers the expected benefit payments on a plan-by-plan basis when setting assumed discount rates. As a result, the Company uses different discount rates for each plan depending on the plan jurisdiction, the demographics of participants and the expected timing of benefit payments. For the U.S. pension and postretirement plans, the Company uses a discount rate provided by an independent third party calculated based on an appropriate mix of high quality bonds. For the non-U.S. pension and postretirement plans, the Company consistently uses the relevant country specific benchmark indices for determining the various discount rates. The Company has elected to utilize a full yield curve approach in the estimation of service and interest components of net periodic benefit cost (credit) for pension and other postretirement for plans that utilize a yield curve approach. The full yield curve approach applies the specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows.

X
- Definition The amount of payments made in the period for which participants are entitled under a pension plan, including benefit payments and settlement payments. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References No definition available. + Details
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- Definition Other changes in fair value of plan assets. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: 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 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123453770&loc=d3e1703-114919 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123453770&loc=d3e1731-114919 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount, before benefit payment, of receipt from prescription drug subsidy which increases benefit obligation of defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in benefit obligation of defined benefit plan from disposal or classification as held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(9) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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