Business Segments (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Summary of Operating Results by Reportable Segment

Operating results by reportable segment are as follows (in millions):  

	Three Months Ended March 31,
	2018			2017
Revenue:
United States	$	562		$	439
Canada		102			96
International		100			96
Total revenue	$	764		$	631
Operating profit (loss):
United States	$	3		$	(26	)
Canada		4			3
International		—			2
Total operating profit (loss)	$	7		$	(21	)
Operating profit (loss) % of revenue:
United States		0.5	%		(5.9	%)
Canada		3.9	%		3.1	%
International		0.0	%		2.1	%
Total operating profit (loss) %		0.9	%		(3.3	%)