Accumulated Other Comprehensive Income/(Loss) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)	$ (9)		$ (7)
Interest	(151)		(162)
Tax (provision) benefit	(52)		(48)
Total reclassifications from Accumulated other comprehensive income/(loss)	133	[1]	131	[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	(1)		(1)
Tax (provision) benefit	0		0
Total reclassifications from Accumulated other comprehensive income/(loss)	(1)		(1)
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
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	$ (1)		$ (1)

[1] Profit attributable to Caterpillar Financial Services Corporation.