Finance Receivables - Delinquency (Details) (Consumer Finance Receivables [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 Days	$ 1,083	$ 952
Greater than 60 Days	432	408
Greater than 30 Days Past Due	1,515	1,360
In repossession	40	41
Financing Receivable, Recorded Investment, Past Due	1,555	1,401
31-60 Days Past Due Percentage of Contractual Amount	4.20%	4.10%
Greater than 60 Days Past Due Percent of Contractual Amount Due	1.70%	1.70%
Greater than 30 Days Past Due Percent of Contractual Amount Due	5.90%	5.80%
In repossession Percent of Contractual Amount Due	0.20%	0.20%
Percent of Contractual Amount Due	6.10%	6.00%
North America Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 Days	994	858
Greater than 60 Days	328	296
Greater than 30 Days Past Due	1,322	1,154
In repossession	36	38
Financing Receivable, Recorded Investment, Past Due	1,358	1,192
International Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
31-60 Days	89	94
Greater than 60 Days	104	112
Greater than 30 Days Past Due	193	206
In repossession	4	3
Financing Receivable, Recorded Investment, Past Due	$ 197	$ 209