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Income taxes (Tables)
3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Provision for income taxes Provision for income taxes is based on the following:
For Three Months Ended
March 31,
 20222021
Taxes calculated using the estimated annual effective tax rate$361 $275 
Discrete tax items(36)(89)
Provision for income taxes$325 $186 
Effective tax rate13 %10 %