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Pension and Other Postretirement Benefit Plans (Change in Plan Assets) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value of Plan Assets, end of year $ 3,041 $ 2,987
United States Pension Benefits
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value of Plan Assets, beginning of year 2,790 2,573
Actual return on plan assets 207 317
Employer contribution 127 181
Plan participants’ contributions 0 0
Gross benefits paid (281) (270)
Change in plan assets, New plan 0 0
Settlements (8) (11)
Foreign currency exchange rates 0 0
Fair Value of Plan Assets, end of year 2,835 2,790
Foreign Pension Benefits
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value of Plan Assets, beginning of year 197 170
Actual return on plan assets 13 19
Employer contribution 24 27
Plan participants’ contributions 1 1
Gross benefits paid (23) (21)
Change in plan assets, New plan 2 (14)
Settlements (6) (17)
Foreign currency exchange rates (2) 4
Fair Value of Plan Assets, end of year 206 197
Other Postretirement Benefits
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value of Plan Assets, beginning of year 0 0
Actual return on plan assets 0 0
Employer contribution 60 55
Plan participants’ contributions 8 9
Gross benefits paid (68) (64)
Change in plan assets, New plan 0 0
Settlements 0 0
Foreign currency exchange rates 0 0
Fair Value of Plan Assets, end of year $ 0 $ 0