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Income taxes (Tables)
6 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Provision for income taxes Provision for income taxes is based on the following:
For Three Months EndedFor Six Months Ended
June 30,June 30,
 2022202120222021
Taxes calculated using the estimated annual effective tax rate$395 $322 $756 $597 
Discrete tax items(5)(11)(41)(100)
Provision for income taxes$390 $311 $715 $497 
Effective tax rate15 %14 %14 %12 %