Finance Receivables - Credit Quality (Details) (Consumer Finance Receivables [Member], North America Segment [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 13,409	[1]	$ 11,493	[1]
Percent	100.00%	[1]	100.00%	[1]
FICO Scores Less Than 540 [Member]
Financing Receivable, Recorded Investment [Line Items]
Amount	3,805		3,511
Percent	28.40%		30.60%
FICO score 540 to 599 [Member]
Financing Receivable, Recorded Investment [Line Items]
Amount	7,308		6,645
Percent	54.50%		57.80%
FICO score 600 to 659 [Member]
Financing Receivable, Recorded Investment [Line Items]
Amount	1,698		1,217
Percent	12.70%		10.60%
FICO score 660 and greater [Member]
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 598		$ 120
Percent	4.40%		1.00%

[1] (a)Balance at the end of the period is the sum of pre-acquisition consumer finance receivables-outstanding balance and post-acquisition consumer finance receivables, net of fees for North America Segment.