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Income taxes (Tables)
9 Months Ended
Sep. 30, 2022
Income Tax Disclosure [Abstract]  
Provision for income taxes Provision for income taxes is based on the following:
For Three Months EndedFor Nine Months Ended
September 30,September 30,
 2022202120222021
Taxes calculated using the estimated annual effective tax rate$391 $337 $1,147 $934 
Discrete tax items(28)(9)(69)(109)
Provision for income taxes$363 $328 $1,078 $825 
Effective tax rate14 %14 %14 %13 %