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Restructuring and Impairment Costs - Schedule of Restructuring Reserve (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve | $ 64 | $ 53 | $ 64 | $ 53
Restructuring reserve | 105 | 0 | 105 | 0
2024 Restructuring Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve beginning balance | 54 |  | 51 |
Plan charges | 127 |  | 138 |
Utilized - cash | (8) |  | (17) |
Noncash and other adjustments | (4) |  | (3) |
Restructuring reserve ending balance | 169 |  | 169 |
2023 Restructuring Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve beginning balance |  | 45 |  | 60
Plan charges |  | 17 |  | 24
Utilized - cash |  | (10) |  | (37)
Noncash and other adjustments |  | 1 |  | 6
Restructuring reserve ending balance |  | 53 |  | 53
Employee Severance and Termination Benefits | 2024 Restructuring Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve beginning balance | 58 |  | 56 |
Plan charges | 127 |  | 138 |
Utilized - cash | (8) |  | (17) |
Noncash and other adjustments | (2) |  | (2) |
Restructuring reserve ending balance | 175 |  | 175 |
Employee Severance and Termination Benefits | 2023 Restructuring Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve beginning balance |  | 49 |  | 69
Plan charges |  | 17 |  | 24
Utilized - cash |  | (10) |  | (37)
Noncash and other adjustments |  | 1 |  | 1
Restructuring reserve ending balance |  | 57 |  | 57
Currency Translation | 2024 Restructuring Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve beginning balance | (4) |  | (5) |
Plan charges | 0 |  | 0 |
Utilized - cash | 0 |  | 0 |
Noncash and other adjustments | (2) |  | (1) |
Restructuring reserve ending balance | $ (6) |  | $ (6) |
Currency Translation | 2023 Restructuring Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve beginning balance |  | (4) |  | (9)
Plan charges |  | 0 |  | 0
Utilized - cash |  | 0 |  | 0
Noncash and other adjustments |  | 0 |  | 5
Restructuring reserve ending balance |  | $ (4) |  | $ (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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