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Employee benefits - Reclassification from cash-settled to equity-settled (Details) - USD ($)
$ in Millions
 2 Months Ended
May 01, 2021
Jun. 30, 2021
Matching Program | Net income    
Disclosure of defined benefit plans [line items]    
Reclassification From Cash-Settled To Equity Settled, Beginning $ 0 $ 0
Remeasurement (5)  
Expense   (5)
Reclassification From Cash-Settled To Equity Settled, Ending (5) (10)
Matching Program | Liability    
Disclosure of defined benefit plans [line items]    
Reclassification From Cash-Settled To Equity Settled, Beginning 33 33
Remeasurement 5  
Reclassification (38)  
Reclassification From Cash-Settled To Equity Settled, Ending 0 0
Matching Program | Stockholders' equity    
Disclosure of defined benefit plans [line items]    
Reclassification From Cash-Settled To Equity Settled, Beginning 0 0
Reclassification 38  
Expense   5
Reclassification From Cash-Settled To Equity Settled, Ending 38 43
Performance Share Unit Program - PSU | Net income    
Disclosure of defined benefit plans [line items]    
Reclassification From Cash-Settled To Equity Settled, Beginning 0 0
Remeasurement 1  
Expense   (1)
Reclassification From Cash-Settled To Equity Settled, Ending 1 0
Performance Share Unit Program - PSU | Liability    
Disclosure of defined benefit plans [line items]    
Reclassification From Cash-Settled To Equity Settled, Beginning 3 3
Remeasurement (1)  
Reclassification (2)  
Reclassification From Cash-Settled To Equity Settled, Ending 0 0
Performance Share Unit Program - PSU | Stockholders' equity    
Disclosure of defined benefit plans [line items]    
Reclassification From Cash-Settled To Equity Settled, Beginning 0 0
Reclassification 2  
Expense   1
Reclassification From Cash-Settled To Equity Settled, Ending $ 2 $ 3