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Pension and Other Postretirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Pre-Tax) in 2011) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year actuarial (gain) loss $ (475) $ 384 $ 283
Total recognized in other comprehensive loss (pre-tax) (508) 420 177
United States Pension Benefits
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year actuarial (gain) loss (481)    
Actuarial (loss) gain recognized during the year (65)    
Current year prior service cost (credit) 0    
Prior service credit (cost) recognized during the year 3    
Total recognized in other comprehensive loss (pre-tax) (543)    
Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax) (508)    
Foreign Pension Benefits
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year actuarial (gain) loss (10)    
Actuarial (loss) gain recognized during the year (10)    
Current year prior service cost (credit) 0    
Prior service credit (cost) recognized during the year (1)    
Total recognized in other comprehensive loss (pre-tax) (21)    
Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax) 0    
Other Postretirement Benefits
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year actuarial (gain) loss 16    
Actuarial (loss) gain recognized during the year (1)    
Current year prior service cost (credit) 2    
Prior service credit (cost) recognized during the year 39    
Total recognized in other comprehensive loss (pre-tax) 56    
Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax) $ 40