Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,855	$ 1,145
Other comprehensive income (loss) before reclassifications	(26)	0
Pre-tax gains reclassified from accumulated other comprehensive loss	(3)	(22)
Tax effects	0	7
Total other comprehensive loss	(29)	(15)
Ending balance	2,161	897
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(234)	(185)
Total other comprehensive loss	(29)	(15)
Ending balance	(263)	(200)
Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	23	64
Other comprehensive income (loss) before reclassifications	5	7
Pre-tax gains reclassified from accumulated other comprehensive loss	(3)	(22)
Tax effects	0	2
Total other comprehensive loss	2	(13)
Ending balance	25	51
Net Unrealized Gains (Losses) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	20	18
Other comprehensive income (loss) before reclassifications	(2)	2
Pre-tax gains reclassified from accumulated other comprehensive loss	0	0
Tax effects	0	0
Total other comprehensive loss	(2)	2
Ending balance	18	20
Defined Benefit Pension Components
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(24)	(19)
Other comprehensive income (loss) before reclassifications	0	0
Pre-tax gains reclassified from accumulated other comprehensive loss	0	0
Tax effects	0	0
Total other comprehensive loss	0	0
Ending balance	(24)	(19)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(253)	(248)
Other comprehensive income (loss) before reclassifications	(29)	(9)
Pre-tax gains reclassified from accumulated other comprehensive loss	0	0
Tax effects	0	5
Total other comprehensive loss	(29)	(4)
Ending balance	$ (282)	$ (252)