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Stockholders' Equity - Share Repurchase Program (Details) - Common stock: - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
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Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Share Repurchase Program [Line Items] |  |  |  |
Total number of shares repurchased (in shares) | 1,216 | 1,387 | 2,506 | 1,889
Average price paid per share (in dollars per share) | $ 245.57 | $ 223.10 | $ 236.11 | $ 234.78
Amount repurchased | $ 299 | $ 309 | $ 592 | $ 443

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