Commitments, Contingencies, Guarantees and Indemnities (Details 2) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Oct. 31, 2006 item	Dec. 31, 2012 item
Engines and related equipment
Purchase commitments
Number of items to be purchased		4
Purchase price		38.5
Non-refundable deposits paid		1.4
CFM56-7B and CFM56-5B spare engines | CFM
Purchase commitments
Maximum number of items to be purchased	45
Commitment period	5 years
Option to purchase additional quantity	30
Number of engines for which purchase orders are outstanding		3