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Restructuring and Related Costs - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Restructuring Reserve [Roll Forward] |  |  |  |  |
Additional restructuring and related costs | $ 254 | $ 418 | $ 293 | $ 763 |
Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring reserve, beginning balance |  |  | 105 |  |
Additional restructuring and related costs | 24 |  | 63 |  | $ 276
Utilized—cash |  |  | (90) |  | (130)
Utilized—noncash |  |  | (24) |  | (41)
Other |  |  | 28 |  |
Restructuring reserve, ending balance | 82 |  | 82 |  | 105
Employee Severance and Termination Benefits | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring reserve, beginning balance |  |  | 93 |  |
Additional restructuring and related costs |  |  | 34 |  | 204
Utilized—cash |  |  | (84) |  | (111)
Utilized—noncash |  |  | 0 |  | 0
Other |  |  | 28 |  |
Restructuring reserve, ending balance | 71 |  | 71 |  | 93
Long-Lived Asset Impairments | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring reserve, beginning balance |  |  | 0 |  |
Additional restructuring and related costs |  |  | 23 |  | 38
Utilized—cash |  |  | 0 |  | 0
Utilized—noncash |  |  | (23) |  | (38)
Other |  |  | 0 |  |
Restructuring reserve, ending balance | 0 |  | 0 |  | 0
Other | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring reserve, beginning balance |  |  | 12 |  |
Additional restructuring and related costs |  |  | 6 |  | 34
Utilized—cash |  |  | (6) |  | (19)
Utilized—noncash |  |  | (1) |  | (3)
Other |  |  | 0 |  |
Restructuring reserve, ending balance | $ 11 |  | $ 11 |  | $ 12

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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, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, 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 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + 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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