Equity Compensation - Narrative (Details) shares in Thousands, $ in Millions	3 Months Ended
	Apr. 30, 2024 USD ($) period shares	Apr. 30, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market capitalization	$ 2,000
Share-based compensation expense	$ 149	$ 165
Expected dividends	0.00%
1998 Employee Qualified Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of compensation that eligible employees can use to purchase common stock, maximum	15.00%
Percentage of fair market value eligible employees can purchase common stock, minimum	85.00%
Number of exercise period | period	4
Term of exercise period	6 months
Term of offering period	24 months
Restricted Stock Units (RSUs) and Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested in period, fair value	$ 396	274
Awards granted in period (in shares) | shares	2,280
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period (in shares) | shares	2,000
Share based compensation expense	$ 127	130
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period (in shares) | shares	7
Share based compensation expense	$ 6	$ 11
Expected dividends		0.00%
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1	$ 6