Finance Receivables - Accretable Yield (Details) (Consumer Finance Receivables [Member], Pre-Acquisition Portfolio [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 255	$ 404
International operations acquisition		127
Accretion of accretable yield	(189)	(342)
Transfer from non-accretable difference	52	74
Foreign currency translation	(7)	(8)
Balance at end of period	111	255
North America Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	181	404	737
International operations acquisition		0	0
Accretion of accretable yield	(139)	(278)	(503)
Transfer from non-accretable difference	46	55	170
Foreign currency translation	0	0	0
Balance at end of period	88	181	404
International Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	74	0
International operations acquisition		127
Accretion of accretable yield	(50)	(64)
Transfer from non-accretable difference	6	19
Foreign currency translation	(7)	(8)
Balance at end of period	$ 23	$ 74