General Information (Details) - USD ($)				3 Months Ended		9 Months Ended
	Jul. 29, 2016	May 25, 2016	Feb. 25, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Feb. 04, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Receivables sold and derecognized				$ 945,000,000	$ 799,000,000	$ 945,000,000	$ 799,000,000
Amount collected on behalf of financial institution				878,000,000	614,000,000	878,000,000	614,000,000
Amount funded by financial institution				95,000,000	178,000,000	95,000,000	178,000,000
Amount of deferred proceeds				23,000,000	$ 40,000,000	23,000,000	40,000,000
Receivables sold						33,000,000	$ 114,000,000
Amount transferred subject to continuing involvement				$ 347,000,000		$ 347,000,000		$ 282,000,000
Dividends declared (in dollars per share)	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.15	$ 0.15
Share repurchase program, authorized amount									$ 250,000,000
Shares repurchased (in shares)						8,448,292	1,628,427
Shares repurchased, average price (in dollars per share)						$ 12.74	$ 14.12
Stock repurchase program, remaining authorized repurchase amount				$ 79,000,000		$ 79,000,000
Business Combinations [Abstract]
Charges Associated with Business Combinations				5,000,000	$ 5,700,000	15,400,000	$ 10,100,000
Other Special Charges				2,400,000	600,000	7,800,000	2,300,000
Loss on Sale of Assets				0	1,700,000	0	1,700,000
Business Combinations and Other Special Charges				$ 7,400,000	$ 8,000,000	$ 23,200,000	$ 14,100,000