Accumulated Other Comprehensive Income/(Loss) (Details 2) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)		$ (2)	$ (4)	$ (6)	$ (7)
Interest		(168)	(152)	(330)	(307)
Reclassifications before tax		164	148	331	293
Tax (provision) benefit		(49)	(44)	(99)	(88)
Total reclassifications from Accumulated other comprehensive income/(loss)	[1]	114	102	229	202
Reclassifications out of Accumulated other comprehensive income/(loss) | Derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications before tax		(25)	(7)	(46)	(9)
Tax (provision) benefit		9	3	16	3
Total reclassifications from Accumulated other comprehensive income/(loss)		(16)	(4)	(30)	(6)
Reclassifications out of Accumulated other comprehensive income/(loss) | Derivative financial instruments | Cross currency contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)		(27)	(6)	(49)	(6)
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)	$ 3	$ (3)

[1] Profit attributable to Caterpillar Financial Services Corporation.