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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 69 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Jun. 30, 2011
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Company match percentage       7.00%      
Contributions       $ 77 $ 76 $ 71  
Curtailment gain $ 16 $ 47   $ 0 63 0  
Cost of Sales              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Curtailment gain $ 15 $ 43          
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      
Decrease in postretirement obligations       $ 0 0    
Postretirement benefit expense       11 12 16  
Curtailment gain       $ (4) 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       40.00%      
United States Pension Benefits | Fixed Income Funds              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       60.00%      
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       50.00%      
United States Pension Benefits | International Equity Securities              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       25.00%      
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       13.00%      
United States Pension Benefits | Venture Capital Funds              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Target plan asset allocations       12.00%      
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%      
Other Postretirement Benefits              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Decrease in postretirement obligations     $ 138 $ 30 (8)    
Postretirement benefit expense       10 (65) (9) $ 104
Curtailment gain       $ 0 $ 63 $ 0