Accumulated Other Comprehensive Income/(Loss) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)	$ (7)		$ (5)		$ (16)		$ (45)
Interest	(158)		(179)		(475)		(557)
Tax (provision) benefit	(47)		(44)		(153)		(126)
Total reclassifications from Accumulated other comprehensive income/(loss)	148	[1]	117	[1]	427	[1]	355	[1]
Reclassifications out of Accumulated other comprehensive income/(loss) | Derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications before tax	(2)		(1)		(4)		(4)
Tax (provision) benefit	1		0		1		1
Total reclassifications from Accumulated other comprehensive income/(loss)	(1)		(1)		(3)		(3)
Reclassifications out of Accumulated other comprehensive income/(loss) | Derivative financial instruments | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)	0		0		0		0
Reclassifications out of Accumulated other comprehensive income/(loss) | Derivative financial instruments | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest	$ (2)		$ (1)		$ (4)		$ (4)

[1] Profit attributable to Caterpillar Financial Services Corporation.