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Pension and Postretirement Plans (Schedule Of Changes In Projected Benefit Obligations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,591 $ 1,718  
United States Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of period 87 79  
Service cost 0 0 $ 0
Interest cost 2 3 3
Foreign currency exchange rate changes (3) 0  
Actuarial (gain) loss 0 11  
Other 0 0  
Benefits paid (11) (6)  
Projected benefit obligation at end of period 75 87 79
Fair value of plan assets 59 66 70
Actual return on plan assets (1) 0  
Defined Benefit Plan, Contributions by Employer 5 2  
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets 0 0  
Other 0 0  
Funded status (16) (21)  
International Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of period 2,138 2,048  
Service cost 2 2 2
Interest cost 76 90 79
Foreign currency exchange rate changes (174) (123)  
Actuarial (gain) loss (112) 191  
Other 0 (4)  
Benefits paid (81) (66)  
Projected benefit obligation at end of period 1,849 2,138 2,048
Fair value of plan assets 1,532 1,652 $ 1,580
Actual return on plan assets 8 194  
Defined Benefit Plan, Contributions by Employer 43 46  
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets (90) (98)  
Other 0 (4)  
Funded status $ (317) $ (486)