Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,621	$ 1,855
Other comprehensive (loss) income before reclassifications	41	(26)
Pre-tax gains reclassified from accumulated other comprehensive loss	(3)	(3)
Tax effects	(1)	0
Total other comprehensive gain (loss)	37	(29)
Ending balance	2,617	2,161
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(285)	(234)
Total other comprehensive gain (loss)	37	(29)
Ending balance	(248)	(263)
Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	24	23
Other comprehensive (loss) income before reclassifications	(22)	5
Pre-tax gains reclassified from accumulated other comprehensive loss	(3)	(3)
Tax effects	2	0
Total other comprehensive gain (loss)	(23)	2
Ending balance	1	25
Net Unrealized Gains (Losses) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	20	20
Other comprehensive (loss) income before reclassifications	1	(2)
Pre-tax gains reclassified from accumulated other comprehensive loss	0	0
Tax effects	0	0
Total other comprehensive gain (loss)	1	(2)
Ending balance	21	18
Defined Benefit Pension Components
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(25)	(24)
Other comprehensive (loss) income before reclassifications	1	0
Pre-tax gains reclassified from accumulated other comprehensive loss	0	0
Tax effects	0	0
Total other comprehensive gain (loss)	1	0
Ending balance	(24)	(24)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(304)	(253)
Other comprehensive (loss) income before reclassifications	61	(29)
Pre-tax gains reclassified from accumulated other comprehensive loss	0	0
Tax effects	(3)	0
Total other comprehensive gain (loss)	58	(29)
Ending balance	$ (246)	$ (282)