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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
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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.

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