Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Profit of consolidated companies	$ 112	$ 97	$ 341	$ 295
Other comprehensive income (loss), net of tax:
Foreign currency translation, net of tax (expense)/benefit	89	(293)	28	(42)
Derivative financial instruments:
Gains (losses) deferred, net of tax (expense)/benefit	(3)	(3)	(4)	(4)
(Gains) losses reclassified to earnings, net of tax (expense)/benefit	1	2	2	11
Total Other comprehensive income (loss), net of tax	87	(294)	26	(35)
Comprehensive income (loss)	199	(197)	367	260
Less: Comprehensive income attributable to the noncontrolling interests	2	5	7	15
Comprehensive income (loss) attributable to Caterpillar Financial Services Corporation	$ 197	$ (202)	$ 360	$ 245