Accumulated Other Comprehensive Income (Loss) (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Comprehensive Income (Loss) (Textual) [Abstract]
After tax loss on derivative reclassified from AOCI to earnings	$ 2	$ 7
Estimated after-tax loss on derivatives to be reclassified from AOCI to earnings within the next 12 months		$ 2