Debt - Carrying Value of Borrowings (Details) - USD ($) $ in Millions	Jul. 31, 2025	Jan. 31, 2025
Debt Instrument [Line Items]
Outstanding Principal as of July 31, 2025	$ 8,500
Total carrying value of debt	8,436	$ 8,433
Less current portion of debt	0	0
Total noncurrent debt	$ 8,436	8,433
Senior Notes | 2028 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	3.70%
Outstanding Principal as of July 31, 2025	$ 1,500
Total carrying value of debt	$ 1,496	1,496
Senior Notes | 2028 Senior Sustainability Notes
Debt Instrument [Line Items]
Contractual Interest Rate	1.50%
Outstanding Principal as of July 31, 2025	$ 1,000
Total carrying value of debt	$ 996	995
Senior Notes | 2031 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	1.95%
Outstanding Principal as of July 31, 2025	$ 1,500
Total carrying value of debt	$ 1,492	1,491
Senior Notes | 2041 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	2.70%
Outstanding Principal as of July 31, 2025	$ 1,250
Total carrying value of debt	$ 1,237	1,236
Senior Notes | 2051 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	2.90%
Outstanding Principal as of July 31, 2025	$ 2,000
Total carrying value of debt	$ 1,979	1,979
Senior Notes | 2061 Senior Notes
Debt Instrument [Line Items]
Contractual Interest Rate	3.05%
Outstanding Principal as of July 31, 2025	$ 1,250
Total carrying value of debt	$ 1,236	$ 1,236