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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Deferred tax assets |  |
Tax loss/credit carryforwards | $ 2,477 | $ 2,535
Accrued interest | 19 | 24
Operating lease liabilities | 132 | 172
Contract accounting | 122 | 127
Depreciation and amortization | 252 | 129
Other assets | 310 | 298
Total deferred tax assets | 3,312 | 3,285
Valuation allowance | (2,242) | (2,264)
Net deferred tax assets | 1,070 | 1,021
Deferred tax liabilities |  |
Operating right-of-use asset | (127) | (161)
Investment basis differences | (10) | (13)
Employee benefits | (82) | (7)
Other liabilities | (133) | (166)
Total deferred tax liabilities | (352) | (347)
Total net deferred tax assets (liabilities) | $ 718 | $ 674

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- Definition The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis and the book basis of accrued interest computed in accordance with generally accepted accounting principles. The difference in basis, will change future taxable income when such basis difference is realized. + References No definition available. + Details
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- Definition The sum of the tax effects as of the balance sheet date of the amount of tax deductions excesses over gross income which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year. Also includes the tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. + References No definition available. + Details
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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