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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2024 | Apr. 30, 2024 | Jul. 31, 2023 | Apr. 30, 2023 | Jul. 31, 2024 | Jul. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 2,161 | $ 1,855 | $ 897 | $ 1,145 | $ 1,855 | $ 1,145
Other comprehensive income (loss) before reclassifications |  |  |  |  | (10) | 20
Pre-tax loss reclassified from accumulated other comprehensive loss |  |  |  |  | (6) | (41)
Tax effects |  |  |  |  | 1 | 8
Total other comprehensive income (loss) | 14 | (29) | 2 | (15) | (15) | (13)
Ending balance | 2,474 | 2,161 | 1,206 | 897 | 2,474 | 1,206
Accumulated other comprehensive loss |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (263) | (234) | (200) | (185) | (234) | (185)
Total other comprehensive income (loss) | 14 | (29) | 2 | (15) |  |
Ending balance | (249) | (263) | (198) | (200) | (249) | (198)
Net Unrealized Gains (Losses) on Derivative Instruments |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 23 |  | 64 | 23 | 64
Other comprehensive income (loss) before reclassifications |  |  |  |  | 2 | 11
Pre-tax loss reclassified from accumulated other comprehensive loss |  |  |  |  | (6) | (40)
Tax effects |  |  |  |  | 1 | 3
Total other comprehensive income (loss) |  |  |  |  | (3) | (26)
Ending balance | 20 |  | 38 |  | 20 | 38
Net Unrealized Gains (Losses) on Available-for-Sale Debt Securities |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 20 |  | 18 | 20 | 18
Other comprehensive income (loss) before reclassifications |  |  |  |  | 1 | 0
Pre-tax loss reclassified from accumulated other comprehensive loss |  |  |  |  | 0 | (1)
Tax effects |  |  |  |  | 0 | 0
Total other comprehensive income (loss) |  |  |  |  | 1 | (1)
Ending balance | 21 |  | 17 |  | 21 | 17
Defined Benefit Pension Components |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | (24) |  | (19) | (24) | (19)
Other comprehensive income (loss) before reclassifications |  |  |  |  | 0 | 0
Pre-tax loss reclassified from accumulated other comprehensive loss |  |  |  |  | 0 | 0
Tax effects |  |  |  |  | 0 | 0
Total other comprehensive income (loss) |  |  |  |  | 0 | 0
Ending balance | (24) |  | (19) |  | (24) | (19)
Foreign Currency Translation Adjustments |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | $ (253) |  | $ (248) | (253) | (248)
Other comprehensive income (loss) before reclassifications |  |  |  |  | (13) | 9
Pre-tax loss reclassified from accumulated other comprehensive loss |  |  |  |  | 0 | 0
Tax effects |  |  |  |  | 0 | 5
Total other comprehensive income (loss) |  |  |  |  | (13) | 14
Ending balance | $ (266) |  | $ (234) |  | $ (266) | $ (234)

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