Supplemental cash flow (Tables)

12 Months Ended

Dec. 31, 2020

Supplemental cash flow

Schedule of supplemental cash flow

	Year Ended December 31,
	2020		2019		2018
Supplemental cash flow information:
Cash paid for interest	$	(205)	$	(193)	$	(152)
Supplemental non-cash investing and financing activities:
Accrued capital expenditures	$	13	$	19	$	19