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Pension and Postretirement Plans (Schedule Of Amounts Recognized On Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent liabilities $ 333 $ 502
United States Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities 0 (5)
Noncurrent liabilities (16) (16)
Pension and Other Postretirement Defined Benefit Plans, Liabilities (16) 21
International Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities 0 0
Noncurrent liabilities (317) (486)
Pension and Other Postretirement Defined Benefit Plans, Liabilities $ 317 $ 486