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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
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year actuarial loss $ 55 $ 242 $ (475)
Total recognized in other comprehensive loss (pre-tax) 79 $ 233 $ (508)
United States Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year actuarial loss 89    
Actuarial (loss) recognized during the year (53)    
Current year prior service cost (credit) 0    
Prior service credit (cost) recognized during the year 3    
Total recognized in other comprehensive loss (pre-tax) 39    
Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax) 51    
Foreign Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year actuarial loss (2)    
Actuarial (loss) recognized during the year (17)    
Current year prior service cost (credit) (3)    
Prior service credit (cost) recognized during the year 0    
Total recognized in other comprehensive loss (pre-tax) (22)    
Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax) (2)    
Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Current year actuarial loss (32)    
Actuarial (loss) recognized during the year 0    
Current year prior service cost (credit) 8    
Prior service credit (cost) recognized during the year 86    
Total recognized in other comprehensive loss (pre-tax) 62    
Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax) $ (3)