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Debt - Senior Notes and Credit Agreement (Details) - USD ($)	6 Months Ended
	Jul. 31, 2025	Jan. 31, 2025	Jan. 31, 2023
Debt Instrument [Line Items]
Less: unamortized debt discount and issuance costs	$ (15,000,000)	$ (16,000,000)
Senior Notes
Debt Instrument [Line Items]
Principal			$ 3,000,000,000
Less: unamortized debt discount and issuance costs			(27,000,000)
Fair value of Senior Notes	$ 2,900,000,000	2,800,000,000
2027 Notes | Senior Notes
Debt Instrument [Line Items]
Principal			$ 1,000,000,000
Contractual interest rate			3.50%
Effective interest rate	3.67%
2029 Notes | Senior Notes
Debt Instrument [Line Items]
Principal			$ 750,000,000
Contractual interest rate			3.70%
Effective interest rate	3.82%
2032 Notes | Senior Notes
Debt Instrument [Line Items]
Principal			$ 1,250,000,000
Contractual interest rate			3.80%
Effective interest rate	3.90%
2022 Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,000,000,000
Long-term line of credit	$ 0	$ 0
Debt instrument, maximum leverage ratio	3.50
Debt instrument, maximum leverage ratio step up	4.50
Base Rate | Minimum | 2022 Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%
Base Rate | Maximum | 2022 Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Secured Overnight Financing Rate (SOFR) | 2022 Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.10%
Secured Overnight Financing Rate (SOFR) | Minimum | 2022 Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%
Secured Overnight Financing Rate (SOFR) | Maximum | 2022 Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%

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