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Stockholders' Equity - Share Repurchase Program (Details) - Common stock: - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
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Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2024 | Oct. 31, 2023
Share Repurchase Program [Line Items] |  |  |  |
Total number of shares repurchased (in shares) | 649 | 677 | 2,538 | 1,312
Average price paid per share (in dollars per share) | $ 242.42 | $ 218.35 | $ 236.73 | $ 218.34
Amount repurchased | $ 157 | $ 147 | $ 600 | $ 286

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