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Income taxes (Tables)
6 Months Ended
Jun. 30, 2023
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,
 2023202220232022
Taxes calculated using the estimated annual effective tax rate$289 $395 $565 $756 
Discrete tax items(9)(5)(47)(41)
Provision for income taxes$280 $390 $518 $715 
Effective tax rate14 %15 %13 %14 %