Segment and Geographic Information (Details 2) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets
External Revenues	$ 699	$ 735	$ 723	$ 690	$ 678	$ 673	$ 676	$ 662	$ 2,847	$ 2,689	$ 2,595
Equipment on Operating Leases and Non-Leased Equipment (included in Other Assets), net	3,690				3,630				3,690	3,630
Inside U.S.
Revenues from External Customers and Long-Lived Assets
External Revenues									1,684	1,551	1,397
Equipment on Operating Leases and Non-Leased Equipment (included in Other Assets), net	2,775				2,554				2,775	2,554
Inside Canada
Revenues from External Customers and Long-Lived Assets
External Revenues									163	157	171
Equipment on Operating Leases and Non-Leased Equipment (included in Other Assets), net	402				413				402	413
Inside Australia
Revenues from External Customers and Long-Lived Assets
External Revenues									134	139	176
All other
Revenues from External Customers and Long-Lived Assets
External Revenues									866	842	$ 851
Equipment on Operating Leases and Non-Leased Equipment (included in Other Assets), net	$ 513				$ 663				$ 513	$ 663