Goodwill (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table summarizes the changes in the carrying amounts of goodwill by segment:

	Years ended December 31,
	2017						2016						2015
	North America		International		Total		North America		International		Total		North America			International			Total
Beginning balance	$	1,105	$	91	$	1,196	$	1,105	$	84	$	1,189	$	1,106		$	138		$	1,244
Foreign currency translation	—		1		1		—		7		7		(1		)	(54		)	(55		)
Ending balance	$	1,105	$	92	$	1,197	$	1,105	$	91	$	1,196	$	1,105		$	84		$	1,189