Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2026	Apr. 30, 2025
Fair Value Disclosures [Abstract]
Realized foreign currency gain (loss) on hedges	$ 2	$ (7)
Unrealized foreign currency gain (loss) on hedges	$ 2	$ (7)

Amount, before tax, of unrealized gain (loss) from foreign currency transaction.

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