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Income Taxes - Tax Examinations (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2025 USD ($) issue
Income Tax Examination [Line Items] |
Number of tax examination primary issues | issue | 3
Income tax examination, estimate of possible loss | $ 544
Potential cash tax payments | 623
Interest deduction tax benefit | 71
Settlement with Taxing Authority |
Income Tax Examination [Line Items] |
Reasonably possible reduction in liability for uncertain tax positions in next twelve months | 2
Income Tax Examination, Issue One |
Income Tax Examination [Line Items] |
Tax examination disputed amount | 651
Income tax examination, estimate of possible loss | 469
Income Tax Examination, Issue Two |
Income Tax Examination [Line Items] |
Tax examination disputed amount | 146
Income tax examination, estimate of possible loss | 101
Income Tax Examination, Issue Three |
Income Tax Examination [Line Items] |
Tax examination disputed amount | 165
Income tax examination, estimate of possible loss | $ 124
Tax examination period | 8 years

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- Definition Estimated amount of loss resulting from an adverse tax position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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