Results of Reportable Segment (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Operating revenues		$ 422	$ 414	$ 1,213	$ 1,247
Depreciation and amortization expense		50	51	148	157
Net write-offs		0	48	24	64
Operating income (loss)		71	19	56	81
North America [Member]
Segment Reporting Information [Line Items]
Operating revenues		411	403	1,184	1,214
Depreciation and amortization expense		52	51	147	155
Net write-offs			34	24	50
Operating income (loss)		69	34	60	96
All Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	[1]	11	11	29	33
Depreciation and amortization expense	[1]	(2)	0	1	2
Net write-offs	[1]		14	0	14
Operating income (loss)	[1]	$ 2	$ (15)	$ (4)	$ (15)

[1] (1)For the three and nine months ended September 30, 2015, All Other is comprised of the financial results of our international assets. For the three and nine months ended September 30, 2014, All Other is comprised of the financial results of our international assets and our insurance subsidiaries’ operations. Our insurance business was sold in the fourth quarter of 2014.