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Share-Based Compensation - Schedule of Data Related to Restricted Stock Unit Award Activity (Details) - RSUs and PSUs - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total fair value of shares vested | $ 179 | $ 192 | $ 143
Total compensation cost, net of estimated forfeitures, related to nonvested restricted stock unit awards not yet recognized, pre-tax | $ 187 | $ 191 | $ 205
Weighted-average period in years over which restricted stock unit award cost is expected to be recognized | 1 year | 1 year | 2 years

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. 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