Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,206	$ 740	$ 1,145	$ 849
Other comprehensive income (loss) before reclassifications			(26)	(53)
Pre-tax losses reclassified from accumulated other comprehensive loss			(54)	(14)
Tax effects			8	(16)
Total other comprehensive loss	(59)	(38)	(72)	(83)
Ending balance	1,482	906	1,482	906
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(198)	(169)	(185)	(124)
Ending balance	(257)	(207)	(257)	(207)
Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			64	24
Other comprehensive income (loss) before reclassifications			27	131
Pre-tax losses reclassified from accumulated other comprehensive loss			(52)	(15)
Tax effects			3	(17)
Total other comprehensive loss			(22)	99
Ending balance	42	123	42	123
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 (loss) before reclassifications			(1)	3
Pre-tax losses reclassified from accumulated other comprehensive loss			(1)	0
Tax effects			0	0
Total other comprehensive loss			(2)	3
Ending balance	16	21	16	21
Defined Benefit Pension Components
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(19)	(16)
Other comprehensive income (loss) before reclassifications			1	(1)
Pre-tax losses reclassified from accumulated other comprehensive loss			(1)	1
Tax effects			0	0
Total other comprehensive 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 (loss) before reclassifications			(53)	(186)
Pre-tax losses reclassified from accumulated other comprehensive loss			0	0
Tax effects			5	1
Total other comprehensive loss			(48)	(185)
Ending balance	$ (296)	$ (335)	$ (296)	$ (335)