Shareholders' equity - Narrative (Details) - USD ($)	3 Months Ended		75 Months Ended
	May 04, 2024	Apr. 29, 2023	May 04, 2024	Mar. 20, 2024	Feb. 03, 2024
Class of Stock [Line Items]
Amount of preferred dividends in arrears	$ 0	$ 0
Amount repurchased	7,400,000	39,100,000
2017 Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,900,000,000
Remaining authorized repurchase amount	853,600,000		$ 853,600,000		$ 661,000,000
Stock Repurchase Program, Increase to Authorized Amount				$ 200,000,000
Amount repurchased	$ 7,400,000	$ 39,100,000	$ 1,200,000,000