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Shareholders' equity - Narrative (Details) - USD ($)	3 Months Ended				6 Months Ended		78 Months Ended
	Aug. 03, 2024	May 04, 2024	Jul. 29, 2023	Apr. 29, 2023	Aug. 03, 2024	Jul. 29, 2023	Aug. 03, 2024	Mar. 20, 2024	Feb. 03, 2024
Class of Stock [Line Items]
Amount of preferred dividends in arrears	$ 0		$ 0		$ 0	$ 0
Amount repurchased	39,800,000	$ 7,400,000	$ 43,300,000	$ 39,100,000
2017 Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount									$ 1,900,000,000
Remaining authorized repurchase amount	$ 813,800,000				813,800,000		$ 813,800,000		$ 661,000,000
Stock Repurchase Program, Increase to Authorized Amount								$ 200,000,000
Amount repurchased					$ 47,200,000	$ 82,400,000	$ 1,300,000,000

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