Business and Summary of Significant Accounting Policies - Changes In the Carrying Amount of Goodwill (Details) - USD ($)	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Accounting Policies [Abstract]
Impairment of goodwill	$ 0	$ 0	$ 0
Goodwill [Roll Forward]
Goodwill, beginning of period, gross		3,774,000,000	3,753,000,000
Less: accumulated impairment losses, beginning of the year		(149,000,000)	(149,000,000)
Goodwill, beginning of the year	3,625,000,000	3,604,000,000
Additions arising from acquisitions during the year	25,000,000	85,000,000
Effect of foreign currency translation and measurement period adjustments	3,000,000	(64,000,000)
Goodwill, end of the year	$ 3,653,000,000	$ 3,625,000,000	$ 3,604,000,000