Financial Instruments (Details 1) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Summary of reconciliation of the carrying amount of derivative financial instruments, net liability position
Beginning balance		$ (37)
Total losses for the period included in net loss	(12)
Net settlement of foreign exchange derivative contracts related to euro denominated debt	16
Termination of foreign exchange derivative contracts (settlement pending)	9
Settlement of interest rate derivative contracts	2
Ending balance	$ (22)	$ (37)