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Pension and Other Postretirement Benefit Plans (PBO and Fair Value of Plan Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
United States Pension Benefits
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation $ 3,546 $ 4,196
Fair value of plan assets 2,835 2,790
Foreign Pension Benefits
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation 397 374
Fair value of plan assets $ 157 $ 117