Segments Operations Reporting by Revenue (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 1,261	$ 867	$ 3,549	$ 2,243
Operating Expenses	525	336	1,409	816
Provision for Loan, Lease, and Other Losses	160	117	408	311
Interest expense	368	168	1,037	414
Acquisition and integration expenses	0	7	0	29
Income before income taxes	208	239	695	673
Operating Segments [Member] | North America Segment [Member]
Segment Reporting Information [Line Items]
Revenues	759	622	2,086	1,750
Operating Expenses	366	246	950	637
Provision for Loan, Lease, and Other Losses	119	108	312	283
Interest expense	124	93	320	266
Income before income taxes	150	175	504	564
Operating Segments [Member] | International Segment [Member]
Segment Reporting Information [Line Items]
Revenues	502	245	1,463	493
Operating Expenses	159	90	459	179
Provision for Loan, Lease, and Other Losses	41	9	96	28
Interest expense	244	76	706	157
Acquisition and integration expenses		7		29
Income before income taxes	58	63	202	100
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenues	14	13	45	28
Operating Expenses			0	0
Provision for Loan, Lease, and Other Losses		0	0	0
Interest expense	14	12	56	19
Income before income taxes	0	1	(11)	9
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(14)	(13)	(45)	(28)
Interest expense	(14)	(13)	(45)	(28)
Income before income taxes		$ 0	$ 0	$ 0