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Restructuring Costs - Restructuring Liability (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | $ 51 |  |
Costs Expensed, Net of Reversals | 153 | $ 111 | $ 216
Costs Not Affecting Restructuring Liability | (27) |  |
Cash Paid | (137) |  |
Other | (1) |  |
Restructuring Liability, ending balance | 39 | 51 |
Fiscal 2025 Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | 0 |  |
Costs Expensed, Net of Reversals | 130 |  |
Costs Not Affecting Restructuring Liability | (20) |  |
Cash Paid | (83) |  |
Other | (1) |  |
Restructuring Liability, ending balance | 26 | 0 |
Fiscal 2024 Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | 10 |  |
Costs Expensed, Net of Reversals | 19 |  |
Costs Not Affecting Restructuring Liability | (3) |  |
Cash Paid | (25) |  |
Other | (1) |  |
Restructuring Liability, ending balance | 0 | 10 |
Other Prior Year and Acquired Plans |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | 41 |  |
Costs Expensed, Net of Reversals | 4 |  |
Costs Not Affecting Restructuring Liability | (4) |  |
Cash Paid | (29) |  |
Other | 1 |  |
Restructuring Liability, ending balance | 13 | 41 |
Workforce Reductions | Fiscal 2025 Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | 0 |  |
Costs Expensed, Net of Reversals | 95 |  |
Costs Not Affecting Restructuring Liability | 1 |  |
Cash Paid | (70) |  |
Other | 0 |  |
Restructuring Liability, ending balance | 26 | 0 |
Workforce Reductions | Fiscal 2024 Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | 8 |  |
Costs Expensed, Net of Reversals | 0 |  |
Costs Not Affecting Restructuring Liability | 0 |  |
Cash Paid | (7) |  |
Other | (1) |  |
Restructuring Liability, ending balance | 0 | 8 |
Workforce Reductions | Other Prior Year and Acquired Plans |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | 40 |  |
Costs Expensed, Net of Reversals | (7) |  |
Costs Not Affecting Restructuring Liability | 0 |  |
Cash Paid | (21) |  |
Other | 0 |  |
Restructuring Liability, ending balance | 12 | 40 |
Facilities Costs | Fiscal 2025 Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | 0 |  |
Costs Expensed, Net of Reversals | 35 |  |
Costs Not Affecting Restructuring Liability | (21) |  |
Cash Paid | (13) |  |
Other | (1) |  |
Restructuring Liability, ending balance | 0 | 0 |
Facilities Costs | Fiscal 2024 Plan |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | 2 |  |
Costs Expensed, Net of Reversals | 19 |  |
Costs Not Affecting Restructuring Liability | (3) |  |
Cash Paid | (18) |  |
Other | 0 |  |
Restructuring Liability, ending balance | 0 | 2 |
Facilities Costs | Other Prior Year and Acquired Plans |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Liability, beginning balance | 1 |  |
Costs Expensed, Net of Reversals | 11 |  |
Costs Not Affecting Restructuring Liability | (4) |  |
Cash Paid | (8) |  |
Other | 1 |  |
Restructuring Liability, ending balance | $ 1 | $ 1 |

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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 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 S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: 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 + Details
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