Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025
Effective Income Tax Rate Reconciliation [Line Items]
Provision for income taxes	$ 10	$ 0	$ 14	$ 6
Pretax income	$ 126	$ 67	$ 204	$ 135
Effective income tax rate	7.70%		6.60%
Netting
Effective Income Tax Rate Reconciliation [Line Items]
Effective income tax rate		0.50%		4.60%

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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