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Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2023
Share Repurchase Program [Line Items] |  |  |
Repurchase and retirement of common shares (in shares) | 3 | 4 | 5
Average repurchase price per share (in dollars per share) | $ 278.86 | $ 201.54 | $ 198.51
November 2022 |  |  |
Share Repurchase Program [Line Items] |  |  |
Amount remained available for repurchase | $ 3,880 |  |
November 2024 |  |  |
Share Repurchase Program [Line Items] |  |  |
Amount remained available for repurchase | $ 5,000 |  |

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