Accumulated Other Comprehensive Income/(Loss) (Details 2) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)		$ (11)	$ (7)	$ (25)	$ (16)
Interest		(144)	(158)	(445)	(475)
Tax (provision) benefit		(44)	(47)	(142)	(153)
Total reclassifications from Accumulated other comprehensive income/(loss)	[1]	109	148	346	427
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)	(2)	(4)	(4)
Tax (provision) benefit		0	1	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		$ (1)	$ (2)	$ (4)	$ (4)

[1] Profit attributable to Caterpillar Financial Services Corporation.