Commitments (Narrative) (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010	Mar. 31, 2011 Option to purchase additional railcars [Member]	Jun. 30, 2011 Railcars in incremental portion of subsequent order [Member]	Jun. 30, 2011 Railcars in incremental portion of subsequent order [Member] Purchase Commitments [Member]	Jun. 30, 2011 Railcars in subsequent order included in 2nd quarter commitments [Member]	Jun. 30, 2011 Railcars ordered subsequent to filing date [Member]	Jun. 30, 2011 Railcars remaining to be purchased under existing commitments [Member]	Mar. 31, 2011 Railcars committed to purchase in Q1 2011 [Member]	Jun. 30, 2011 A Three Twenty Zero NEO [Member]	Jun. 30, 2011 Deferred Purchase Agreements [Member]	Dec. 31, 2010 Deferred Purchase Agreements [Member]
Additional funding commitments	$ 500,000,000	$ 700,000,000
Financing commitments that are senior facilities	57.00%
Percentage of facilities where CIT is lead agent	28.00%
Undrawn commitments	306,000,000
Other liabilities	$ 2,432,000,000	$ 2,466,900,000									$ 4,000,000	$ 4,200,000
Aircraft remain to be purchased, contractual commitments	148									50
Railcars			1,750	2,750	2,750	2,250	5,000	5,550	3,500