Financial Instruments (Details 1) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Summary of reconciliation of the carrying amount of derivative financial instruments, net liability position
Balance as of January 1, 2012	$ (37)
Total losses for the period included in net loss	(11)
Net settlement of foreign currency derivative contracts related to euro denominated debt	40
Settlement of interest rate derivative contracts	4
Termination of foreign exchange derivative contracts (settlement pending)	7
Balance as of September 30, 2012	$ 3