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Stockholders' Deficit - Schedule of Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024 | Apr. 29, 2026
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Beginning balance | $ 7,469 | $ 6,615 | $ 3,613 |
Share repurchase authorization |  | 4,000 | 6,000 |
Ending balance | $ 2,719 | $ 7,469 | $ 6,615 |
Subsequent Event |  |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Additional shares authorized for repurchase (in shares) |  |  |  | 5,000.0
Shares authorized for repurchase (in shares) |  |  |  | 7,700.0
Open Market Transactions |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Total Number of Shares Purchased (in shares) | 3.3 | 5.8 | 6.9 |
Average Price Paid Per Share (in dollars per share) | $ 753.61 | $ 543.05 | $ 436.46 |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Shares repurchased | $ (2,500) | $ (3,146) | $ (2,998) |
Accelerated Share Repurchase, March 2026 |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Total Number of Shares Purchased (in shares) | 2.0 |  |  |
Average Price Paid Per Share (in dollars per share) | $ 940.91 |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |
Shares repurchased | $ (2,250) |  |  |
Shares authorized for repurchase (in shares) | 2,300.0 |  |  |

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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