Financing Arrangements and Derivative Financial Instruments (Schedule of Classification of Changes in Fair Values of Foreign Currency Contracts) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financing Arrangements and Derivative Financial Instruments [Abstract]
Amounts deferred to AOCL	$ 5	$ (5)
Amount of derferred loss reclassified from AOCL into CGS	(14)	10
Amounts excluded from effectiveness testing	$ (1)	$ 2