Transactions with Related Parties (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction
Dividend paid to Caterpillar	$ 400,000,000	$ 200,000,000	$ 250,000,000
Maximum borrowing capacity from Caterpillar, Variable lending agreements	2,310,000,000
Maximum lending capacity to Caterpillar, Variable lending agreements	1,290,000,000
Amount available, Committed credit facility extended to Caterpillar	2,000,000,000
Notes payable to Caterpillar	1,108,000,000	1,118,000,000	208,000,000
Notes receivable from Caterpillar	414,000,000	345,000,000	360,000,000
Discounts earned on purchased receivables	243,000,000	233,000,000	241,000,000
Caterpillar
Related Party Transaction
Dividend paid to Caterpillar	400,000,000	200,000,000	250,000,000
Maximum borrowing capacity from Caterpillar, Variable lending agreements	2,310,000,000
Maximum lending capacity to Caterpillar, Variable lending agreements	1,290,000,000
Amount available, Committed credit facility extended to Caterpillar	2,000,000,000
Interest expense, Caterpillar	7,000,000	7,000,000	4,000,000
Interest income on Notes Receivable with Caterpillar	18,000,000	19,000,000	21,000,000
Fees on committed credit facility extended to Caterpillar	41,000,000	41,000,000	41,000,000
Purchases of receivables from Caterpillar	36,816,000,000	33,018,000,000	36,665,000,000
Discounts earned on purchased receivables	243,000,000	233,000,000	241,000,000
Balance of purchased receivables	3,238,000,000	3,092,000,000	3,114,000,000
Marketing program payments received	173,000,000	189,000,000	160,000,000
Charges for employee medical plans and postretirement benefit plans administered by Caterpillar	30,000,000	27,000,000	26,000,000
Contributions to defined benefit plans	7,000,000	7,000,000	7,000,000
Stock based compensation expense	11,000,000	11,000,000	10,000,000
Operational and administrative support charges reimbursed to Caterpillar	37,000,000	33,000,000	32,000,000
Administrative support services to certain Caterpillar subsidiaries reimbursed by Caterpillar	$ 12,000,000	$ 12,000,000	$ 10,000,000