Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Customer and other miscellaneous receivables	$ 457	$ 417
Collateral held for resale, at net realizable value	432	654
Other	136	180
Total other assets	1,025	1,251
Caterpillar
Other	$ 31	$ 21