Financial Instruments - Schedule of Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Oct. 31, 2025	Jan. 31, 2025
Cash equivalents:
Amortized Cost	$ 1,989	$ 1,599
Long-term
Total, amortized cost	1,940	1,424
Total, Gross unrealized gains	26	13
Total, Gross unrealized losses	0	(1)
Total, fair value	1,966	1,436
Corporate debt securities
Short-term
Amortized Cost	55	79
Fair Value	55	79
Long-term
Amortized Cost	128	96
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	0
Fair Value	129	97
U.S. government securities
Cash equivalents:
Fair Value	18
Short-term
Amortized Cost	70	74
Fair Value	70	74
Long-term
Amortized Cost	63	52
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Fair Value	63	51
Commercial paper
Short-term
Amortized Cost	116	96
Fair Value	116	96
Asset-backed securities
Short-term
Amortized Cost	27	19
Fair Value	27	19
Long-term
Amortized Cost	72	71
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	72	71
Certificates of deposit
Short-term
Amortized Cost	18
Fair Value	18
Agency mortgage-backed securities
Short-term
Amortized Cost	11
Fair Value	11
Long-term
Amortized Cost	28	40
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	28	40
Other
Short-term
Amortized Cost	3	19
Fair Value	3	19
Long-term
Amortized Cost	10	8
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	10	8
Mutual funds
Long-term
Other investments	114	106
Other investments, gross unrealized gains	25	12
Other investments, gross unrealized losses	0	0
Other investments, fair value	139	118
Money market funds
Cash equivalents:
Amortized Cost	1,001	618
Fair Value	1,001	618
Commercial paper
Cash equivalents:
Amortized Cost	154	85
Fair Value	154	85
Certificates of deposit
Cash equivalents:
Amortized Cost	48	38
Fair Value	48	38
U.S. government securities
Cash equivalents:
Amortized Cost	18	19
Fair Value	18	19
Other
Cash equivalents:
Amortized Cost	4	4
Fair Value	$ 4	$ 4