Pension And Other Postretirement Benefits (Schedule Of Amounts Expected To Be Recognized In Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (benefit) recognition	$ 18	$ 19	[1]	$ 17	[1]	$ 16	[1]
Net actuarial loss recognition	388	(247)	[1]	(181)	[1]	(111)	[1]
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (benefit) recognition	(16)	(17)	[2]	(15)	[2]	(11)	[2]
Net actuarial loss recognition	$ 10	$ (26)	[2]	$ (33)	[2]	$ (41)	[2]

[1] In 2011, 2010, and 2009, net periodic benefit cost for U.S pension plans was $190, $155, and $135, respectively.

[2] In 2011, 2010, and 2009, net periodic benefit cost for other postretirement benefits reflects a reduction of $43, $39, and $42, respectively, related to the recognition of the federal subsidy awarded under Medicare Part D.