Restructuring, Impairment And Other Charges (Credits) (Schedule Of Restructuring, And Other Charges And (Credits)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Reserve, beginning balance				$ 10	$ 27	$ 100
Net charges/(reversals)				52	(1)	(5)
Non-cash adjustments				(12)		(2)
Cash payments				(8)	(16)	(66)
Reserve, ending balance	42	10	27	42	10	27
Settlement of business interruption and property damage insurance claims			(324)			(324)
Assets to be held and used				44	130
Assets to be disposed of				37
Total impairment charges	44	130		81	130	(324)
Total restructuring, impairment and other charges (credits)				133	129	(329)
Employee Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Reserve, beginning balance				2	15	80
Net charges/(reversals)				47	(1)	(5)
Non-cash adjustments				(7)		(2)
Cash payments				(4)	(12)	(58)
Reserve, ending balance	38	2	15	38	2	15
Other Charges (Credits) [Member]
Restructuring Cost and Reserve [Line Items]
Reserve, beginning balance				8	12	20
Net charges/(reversals)				5
Non-cash adjustments				(5)
Cash payments				(4)	(4)	(8)
Reserve, ending balance	$ 4	$ 8	$ 12	$ 4	$ 8	$ 12