Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 711	$ 698	$ 694	$ 680	$ 679	$ 678	$ 668	$ 668	$ 662	$ 668	$ 675	$ 640	$ 2,783		$ 2,693		$ 2,645
Profit before income taxes	208	165	158	187	124	153	144	170	111	126	152	115	718		591		504
Profit	$ 160	$ 118	$ 111	$ 141	$ 99	$ 109	$ 104	$ 120	$ 95	$ 93	$ 107	$ 83	$ 530	[1]	$ 432	[1]	$ 378	[1]

[1] Profit attributable to Caterpillar Financial Services Corporation.