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Restructuring and Impairment Costs - Schedule of Restructuring Reserve (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring reserve beginning balance | $ 51 |
Plan charges | 11 |
Utilized - cash | (9) |
Noncash and other adjustments | 1 |
Restructuring reserve ending balance | 54 |
2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring reserve beginning balance |  | $ 60
Plan charges |  | 7
Utilized - cash |  | (27)
Noncash and other adjustments |  | 5
Restructuring reserve ending balance |  | 45
Employee Severance and Termination Benefits | 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring reserve beginning balance | 56 |
Plan charges | 11 |
Utilized - cash | (9) |
Noncash and other adjustments | 0 |
Restructuring reserve ending balance | 58 |
Employee Severance and Termination Benefits | 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring reserve beginning balance |  | 69
Plan charges |  | 7
Utilized - cash |  | (27)
Noncash and other adjustments |  | 0
Restructuring reserve ending balance |  | 49
Currency Translation | 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring reserve beginning balance | (5) |
Plan charges | 0 |
Utilized - cash | 0 |
Noncash and other adjustments | 1 |
Restructuring reserve ending balance | $ (4) |
Currency Translation | 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Restructuring reserve beginning balance |  | (9)
Plan charges |  | 0
Utilized - cash |  | 0
Noncash and other adjustments |  | 5
Restructuring reserve ending balance |  | $ (4)

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 17 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-17 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482047/420-10-45-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-1 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2 + Details
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