Introduction (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011
Introduction [Abstract]
Total original notional amount of the guarantees	$ 120
Current guarantee obligations outstanding	12
Short term obligations outstanding	3
Long term obligations outstanding	9
Maximum Range of the term of leveraged lease agreements	45 years
Expected potential impairment loss on abandonment of the project	$ 80