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Stockholders' equity - ASR - 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
Stockholders Equity Note              
Stock repurchase program authorized amount   $ 350 $ 231     $ 231 $ 350
Accelerated share repurchases price paid per share $ 75.8430       $ 78.9443    
Accelerated share repurchases settlement payment     $ 231 $ 400      
Initial shares received as part of an accelerated share repurchase program   3,785,831 2,339,241 3,483,942   2,339,241  
Common Shares Repurchased Accelerated Share Repurchase Agreements 828,965       1,582,922    
Common shares attributable to ASR 4,614,796       5,066,864    
Accelerated share repurchase completed         $ 400 $ 400  
Treasury stock              
Stockholders Equity Note              
Common stock purchases $ 61 $ (280) $ (185) $ (320) $ 120    
Capital surplus              
Stockholders Equity Note              
Common stock purchases   $ (70) $ (46) $ (80)