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Income Taxes - Income Tax Contingency (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Income Tax Contingency [Line Items] |  |  |
Deferred tax liability, undistributed foreign earnings | $ 32 |  |
Undistributed earnings of foreign subsidiaries | 1,400 |  |
Liability For Uncertain Tax Positions [Abstract] |  |  |
Tax | 291 | $ 361 | $ 399
Interest | 117 | 103 | 79
Penalties | 3 | 4 | 18
Reduction of receivables | (71) | (72) |
Net of tax attributes | (1) | (2) |
Total | 339 | 394 |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance at beginning of fiscal year | 361 | 399 | 422
Gross increases related to prior year tax positions | 37 | 14 | 31
Gross decreases related to prior year tax positions | (54) | (55) | (17)
Gross increases related to current year tax positions | 15 | 8 | 8
Gross decreases related to current year tax positions | (12) | 0 | 0
Settlements and statute of limitation expirations | (55) | (5) | (43)
Foreign exchange and others | (1) | 0 | (2)
Balance at end of fiscal year | 291 | 361 | 399
Liability for uncertain tax positions that if recognized would affect the effective tax rate | 336 | 365 | 368
Interest Accrued Related to Uncertain Tax Positions and Penalties [Abstract] |  |  |
Increase (decrease) in interest expense | 14 | 24 | 3
Tax expense on interest | 11 | 18 | 1
Changes in accrued expense for penalties | 0 | (14) | (2)
Liability recognized for accrued interest | 117 | 103 | 79
Liability recognized for accrued interest, tax | 89 | 79 | 61
Liability recognized for accrued penalties | 3 | $ 4 | $ 18
Federal |  |  |
Income Tax Contingency [Line Items] |  |  |
Interest deduction carryforwards with no expiration | 25 |  |
State |  |  |
Income Tax Contingency [Line Items] |  |  |
Interest deduction carryforwards with no expiration | $ 1,230 |  |

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- Definition Liability For Uncertain Tax Positions [Abstract] + References No definition available. + Details
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- Definition Total liability for uncertain tax position as of the balance sheet date. + References No definition available. + Details
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- Definition Unrecognized Tax Benefit, Offset to Receivable + References No definition available. + Details
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- Definition Unrecognized Tax Benefits, Increase (Decrease) from Income Tax Penalties Expense + References No definition available. + Details
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- Definition Unrecognized Tax Benefits, Increase (Decrease) From Interest on Income Taxes Expense + References No definition available. + Details
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- Definition The gross amount of increases (decreases) in unrecognized tax benefits resulting from foreign exchange and others. + References No definition available. + Details
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- Definition This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity, net of tax. + References No definition available. + Details
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- Definition This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity, net of tax. + References No definition available. + Details
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible interest carryforward. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 740 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482603/740-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482620/740-10-25-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -SubTopic 740 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477617/942-740-50-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -SubTopic 740 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478822/944-740-50-1 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A + Details
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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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