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Pension and Postretirement Plans (Schedule Of Amounts In Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Total in accumulated other comprehensive loss $ 560 $ 670 $ 608
United States Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized actuarial loss, net of tax 25 31  
Net actuarial loss, tax 11 9  
Total in accumulated other comprehensive loss 25 31  
International Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized actuarial loss, net of tax 535 639  
Net actuarial loss, tax 198 222  
Total in accumulated other comprehensive loss $ 535 $ 639