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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 54 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Jun. 30, 2011
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Company match percentage       7.00%      
Contributions       $ 76 $ 71 $ 68  
Curtailment gain $ 16 $ 47   63 0 0  
Cost of Sales              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Curtailment gain $ 15 $ 43          
Other Postretirement Benefits              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Plan amendments     $ 138 (8) (14)    
Net periodic benefit cost       (65) (9) (16) $ 106
Curtailment gain       $ 63 0 0  
United States Pension Benefits              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Service requirement       10 years      
Plan, age requirement       55 years      
Plan amendments       $ 0 0    
Net periodic benefit cost       12 16 35  
Curtailment gain       $ 0 $ 0 $ 0  
United States Pension Benefits | Equity Securities              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       41.00%      
United States Pension Benefits | Fixed Income Funds              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       59.00%      
United States Pension Benefits | US Large-Cap Companies              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       51.00%      
United States Pension Benefits | International Equity Securities              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       27.00%      
United States Pension Benefits | US Mid and Small Cap Companies | United States              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       14.00%      
United States Pension Benefits | Venture Capital Funds              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       8.00%      
United States Pension Benefits | Corporate Debt Securities              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       75.00%      
United States Pension Benefits | US Treasury and Government              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       25.00%