Income taxes

6 Months Ended

Jun. 30, 2022

Income Tax Disclosure [Abstract]

Income taxes

Income taxes

Provision for income taxes is based on the following:

	For Three Months Ended						For Six Months Ended
	June 30,						June 30,
	2022			2021			2022			2021
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 rate	15		%	14		%	14		%	12		%

The effective tax rate differs from the 21% U.S. statutory corporate tax rate due to the effect of U.S. tax benefits.