Accumulated Other Comprehensive Income/(Loss) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Other income (expense)	$ (3)		$ 1
Interest	191		204
Tax (provision) benefit	43		46
Total reclassifications from Accumulated other comprehensive income/(loss)	141	[1]	120	[1]
Reclassifications out of Accumulated other comprehensive income/(loss) | Derivative financial instruments
Reclassifications before tax	(1)
Tax (provision) benefit	0
Total reclassifications from Accumulated other comprehensive income/(loss)	(1)
Reclassifications out of Accumulated other comprehensive income/(loss) | Derivative financial instruments | Foreign exchange contracts
Other income (expense)	0
Reclassifications out of Accumulated other comprehensive income/(loss) | Derivative financial instruments | Interest rate contracts
Interest	$ (1)

[1] Profit attributable to Caterpillar Financial Services Corporation.