Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)		$ (10)	$ (4)	$ (26)	$ (14)
Interest		(137)	(198)	(462)	(599)
Reclassifications before tax		96	184	312	467
Tax (provision) benefit		(44)	(49)	(102)	(144)
Total reclassifications from Accumulated other comprehensive income (loss)	[1]	48	129	197	306
Reclassifications out of Accumulated other comprehensive income (loss) | Derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications before tax		(71)	95	(47)	112
Tax (provision) benefit		14	(22)	9	(25)
Total reclassifications from Accumulated other comprehensive income (loss)		(57)	73	(38)	87
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)		(63)	89	(35)	91
Interest		8	9	28	23
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		$ (16)	$ (3)	$ (40)	$ (2)

[1] Profit attributable to Caterpillar Financial Services Corporation.