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Pension and Postretirement Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
United States Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 0 1 1 1
Expected return on plan assets (1) (1) (2) (2)
Recognized actuarial loss 2 1 3 2
Defined Benefit Plan, Net Periodic Benefit Cost 1 1 2 1
International Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 1 1
Interest cost 19 22 38 45
Expected return on plan assets (25) (26) (49) (52)
Recognized actuarial loss 11 10 22 19
Defined Benefit Plan, Net Periodic Benefit Cost $ 6 $ 7 12 $ 13
Contributions by employer     21  
Estimated future employer contributions in next fiscal year     $ 43