Net Income Per Share - Reconciliation of Denominator Used in Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Numerator:
Net income	$ 1,541	$ 1,533
Denominator:
Weighted-average shares outstanding for basic net income per share (in shares)	960	970
Employee stock awards (in shares)	10	15
Weighted-average shares outstanding for diluted net income per share (in shares)	970	985