Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025
Fair Value Disclosures [Abstract]
Realized foreign currency gain (loss) on hedges	$ 2	$ 1	$ 3	$ (6)
Unrealized foreign currency gain (loss) on hedges	$ 2	$ 1	$ 3	$ (6)

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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration