Derivatives And Other Financial Instruments (Gain Or Loss On Hedged Items) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	$ 15	$ (95)	$ (58)
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	17	87	50
Sales [Member] | Aluminum Contracts [Member]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	(27)	(113)	(94)
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	26	105	86
Interest Expense [Member] | Interest Rate Contracts [Member]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	42	18	36
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	$ (9)	$ (18)	$ (36)