Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 642	$ 651	$ 659	$ 643	$ 648	$ 653	$ 683	$ 689	$ 2,595		$ 2,673		$ 2,885
Profit before income taxes	122	146	148	145	129	153	150	187	561		619		753
Profit	$ 85	$ 97	$ 102	$ 100	$ 114	$ 109	$ 104	$ 133	$ 384	[1]	$ 460	[1]	$ 535	[1]

[1] Profit attributable to Caterpillar Financial Services Corporation.