Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 681	$ 1,128	$ 849	$ 965
Other comprehensive income (loss) before reclassifications			(29)	8
Pre-tax gains (loss) reclassified from accumulated other comprehensive loss			(5)	10
Tax effects			(11)	(5)
Total other comprehensive (loss) income	(21)	(11)	(45)	13
Ending balance	740	1,328	740	1,328
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(148)	(102)	(124)	(126)
Ending balance	(169)	(113)	(169)	(113)
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			90	14
Pre-tax gains (loss) reclassified from accumulated other comprehensive loss			(5)	10
Tax effects			(12)	(4)
Total other comprehensive (loss) income			73	20
Ending balance	97	(4)	97	(4)
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			3	8
Pre-tax gains (loss) reclassified from accumulated other comprehensive loss			0	0
Tax effects			0	0
Total other comprehensive (loss) income			3	8
Ending balance	21	14	21	14
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			0	0
Tax effects			0	0
Total other comprehensive (loss) income			0	0
Ending balance	(16)	(21)	(16)	(21)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(150)	(87)
Other comprehensive income (loss) before reclassifications			(122)	(14)
Pre-tax gains (loss) reclassified from accumulated other comprehensive loss			0	0
Tax effects			1	(1)
Total other comprehensive (loss) income			(121)	(15)
Ending balance	$ (271)	$ (102)	$ (271)	$ (102)