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Shareholders' equity - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions
 3 Months Ended 20 Months Ended
Mar. 14, 2022
Jan. 24, 2022
Apr. 29, 2023
Apr. 30, 2022
Apr. 29, 2023
Mar. 31, 2023
Jan. 28, 2023
Jan. 21, 2022
Class of Stock [Line Items]                
Amount of preferred dividends in arrears     $ 0 $ 0        
Amount repurchased     39,100,000 268,200,000        
Accelerated share repurchases, total value committed to repurchase               $ 250,000,000
Accelerated share repurchases, payment   $ 250,000,000            
Treasury stock, shares, acquired (in shares) 0.8 2.5            
Accelerated share repurchases, initial price paid per share (usd per share)   $ 80            
Accelerated share repurchases, prepayment amount, percent paid up front   80.00%            
Accelerated share repurchases, prepayment amount, percent to be paid upon final settlement 20.00%              
2017 Program                
Class of Stock [Line Items]                
Stock repurchase program, authorized amount             $ 1,700,000,000  
Remaining authorized repurchase amount     761,200,000   $ 761,200,000 $ 775,000,000 $ 537,300,000  
Amount repurchased     $ 39,100,000 $ 318,200,000 $ 1,200,000,000