Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)		$ (6)	$ (6)	$ (16)	$ (10)
Interest		(150)	(200)	(325)	(401)
Reclassifications before tax		89	141	216	283
Tax (provision) benefit		(25)	(57)	(58)	(95)
Total reclassifications from Accumulated other comprehensive income (loss)	[1]	59	79	149	177
Reclassifications out of Accumulated other comprehensive income (loss) | Derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications before tax		(53)	3	24	17
Tax (provision) benefit		11	0	(5)	(3)
Total reclassifications from Accumulated other comprehensive income (loss)		(42)	3	19	14
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)		(43)	(4)	28	2
Interest		9	7	20	14
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		$ (19)	$ 0	$ (24)	$ 1

[1] Profit attributable to Caterpillar Financial Services Corporation.