Income taxes

6 Months Ended

Jun. 30, 2023

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,
	2023			2022			2023			2022
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 rate	14		%	15		%	13		%	14		%

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