Stockholders' equity (Tables)

9 Months Ended

Sep. 30, 2021

Stockholders' equity

Schedule of changes in the components of accumulated other comprehensive income (loss)

	Foreign Currency Translation Adjustments		Unrealized Loss on Interest Rate Swaps		Loss on Pension and Other Postretirement Plans		Total Accumulated Other Comprehensive Loss
Balance as of December 31, 2020	$	1	$	(20)	$	(101)	$	(120)
Other comprehensive (loss) income		(1)		6		1		6
Tax benefit (expense)		—		—		—		—
Balance as of March 31, 2021	$	—	$	(14)	$	(100)	$	(114)
Other comprehensive income		—		4		1		5
Tax benefit (expense)		—		—		—		—
Balance as of June 30, 2021	$	—	$	(10)	$	(99)	$	(109)
Other comprehensive income		—		3		1		4
Tax benefit (expense)		—		—		—		—
Balance as of September 30, 2021	$	—	$	(7)	$	(98)	$	(105)