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Net income per common share - Additional Information (Details) - Accelerate share repurchase - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 6 Months Ended 9 Months Ended
Sep. 09, 2021
May 03, 2021
Aug. 26, 2022
Mar. 02, 2022
Jul. 12, 2022
Sep. 30, 2022
Sep. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share              
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount           699,181  
Initial shares received as part of an accelerated share repurchase program   3,785,831 2,339,241 3,483,942   2,339,241  
Stock repurchase program authorized amount   $ 350 $ 231     $ 231 $ 350
Additional common shares repurchased 828,965       1,582,922    
Accelerated share repurchase completed         $ 400 $ 400  
Accelerated share repurchases price paid per share $ 75.8430       $ 78.9443