Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 849	$ 965
Other comprehensive income (loss) before reclassifications	(11)	24
Pre-tax gains (loss) reclassified from accumulated other comprehensive loss	(5)	4
Tax effects	(8)	(4)
Total other comprehensive (loss) income	(24)	24
Ending balance	681	1,128
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(124)	(126)
Ending balance	(148)	(102)
Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	24	(24)
Other comprehensive income (loss) before reclassifications	65	8
Pre-tax gains (loss) reclassified from accumulated other comprehensive loss	(2)	4
Tax effects	(8)	(2)
Total other comprehensive (loss) income	55	10
Ending balance	79	(14)
Net Unrealized Gains (Losses) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	18	6
Other comprehensive income (loss) before reclassifications	(1)	4
Pre-tax gains (loss) reclassified from accumulated other comprehensive loss	0	0
Tax effects	0	0
Total other comprehensive (loss) income	(1)	4
Ending balance	17	10
Defined Benefit Pension Components
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(16)	(21)
Other comprehensive income (loss) before reclassifications	0	0
Pre-tax gains (loss) reclassified from accumulated other comprehensive loss	(3)	0
Tax effects	0	0
Total other comprehensive (loss) income	(3)	0
Ending balance	(19)	(21)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(150)	(87)
Other comprehensive income (loss) before reclassifications	(75)	12
Pre-tax gains (loss) reclassified from accumulated other comprehensive loss	0	0
Tax effects	0	(2)
Total other comprehensive (loss) income	(75)	10
Ending balance	$ (225)	$ (77)