Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
Impaired direct financing receivables	$ 0	$ 0
Rent expense	130,000,000	127,000,000	$ 132,000,000
Contingent rentals from operating leases	357,000,000	342,000,000	342,000,000
Direct Financing Leases
Operating Leased Assets [Line Items]
Contingent rental income	$ 15,000,000	$ 12,000,000	$ 12,000,000
Trucks and Tractors
Operating Leased Assets [Line Items]
Minimum lease term of revenue earning equipment	3 years
Maximum lease term of revenue earning equipment	7 years
Trailers
Operating Leased Assets [Line Items]
Maximum lease term of revenue earning equipment	10 years