Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 897	$ 681	$ 1,145	$ 849
Other comprehensive income before reclassifications			20	(29)
Pre-tax loss reclassified from accumulated other comprehensive loss			(41)	(5)
Tax effects			8	(11)
Total other comprehensive income (loss)	2	(21)	(13)	(45)
Ending balance	1,206	740	1,206	740
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(200)	(148)	(185)	(124)
Ending balance	(198)	(169)	(198)	(169)
Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			64	24
Other comprehensive income before reclassifications			11	90
Pre-tax loss reclassified from accumulated other comprehensive loss			(40)	(5)
Tax effects			3	(12)
Total other comprehensive income (loss)			(26)	73
Ending balance	38	97	38	97
Net Unrealized Gains (Losses) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			18	18
Other comprehensive income before reclassifications			0	3
Pre-tax loss reclassified from accumulated other comprehensive loss			(1)	0
Tax effects			0	0
Total other comprehensive income (loss)			(1)	3
Ending balance	17	21	17	21
Defined Benefit Pension Components
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(19)	(16)
Other comprehensive income before reclassifications			0	0
Pre-tax loss reclassified from accumulated other comprehensive loss			0	0
Tax effects			0	0
Total other comprehensive income (loss)			0	0
Ending balance	(19)	(16)	(19)	(16)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(248)	(150)
Other comprehensive income before reclassifications			9	(122)
Pre-tax loss reclassified from accumulated other comprehensive loss			0	0
Tax effects			5	1
Total other comprehensive income (loss)			14	(121)
Ending balance	$ (234)	$ (271)	$ (234)	$ (271)