Business Segments (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Summary of Operating Results by Reportable Segment

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Revenue:
United States	$	630		$	506		$	1,792		$	1,426
Canada		93			96			270			271
International		99			95			301			282
Total revenue	$	822		$	697		$	2,363		$	1,979
Operating profit (loss):
United States	$	21		$	(10	)	$	40		$	(52	)
Canada		5			4			10			9
International		—			—			1			2
Total operating profit (loss)	$	26		$	(6	)	$	51		$	(41	)
Operating profit (loss) % of revenue:
United States		3.3	%		(2.0	%)		2.2	%		(3.6	%)
Canada		5.4	%		4.2	%		3.7	%		3.3	%
International		0.0	%		0.0	%		0.3	%		0.7	%
Total operating profit (loss) %		3.2	%		(0.9	%)		2.2	%		(2.1	%)