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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 81 Months Ended
Dec. 31, 2017
Sep. 30, 2015
Mar. 31, 2015
Jun. 30, 2011
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Company match percentage         7.00%      
Contributions         $ 82 $ 77 $ 76  
Curtailment gain   $ 16 $ 47   0 0 63  
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]                
Decrease in postretirement obligations       $ 138 (16) 30    
Postretirement benefit expense         (23) (10) 65 $ 92
Curtailment gain         0 0 63  
Transfer of liabilities         $ 0 0    
United States Pension Benefits | Postretirement Health Coverage                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Service requirement         10 years      
Plan, age requirement         55 years      
United States Pension Benefits | Pension Benefits                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Decrease in postretirement obligations         $ 0 0    
Postretirement benefit expense         (8) (11) (12)  
Curtailment gain         0 (4) $ 0  
Transfer of liabilities $ 64       $ (64) $ 0    
United States Pension Benefits | Pension Benefits | Equity Securities                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Target plan asset allocations 40.00%       40.00%     40.00%
United States Pension Benefits | Pension Benefits | Fixed Income Funds                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Target plan asset allocations 60.00%       60.00%     60.00%
United States Pension Benefits | 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%       50.00%     50.00%
United States Pension Benefits | Pension Benefits | International Equity Securities                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Target plan asset allocations 25.00%       25.00%     25.00%
United States Pension Benefits | Pension Benefits | US Mid and Small Cap Companies | United States Pension Benefits                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Target plan asset allocations 13.00%       13.00%     13.00%
United States Pension Benefits | Pension Benefits | Venture Capital Funds                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Target plan asset allocations 12.00%       12.00%     12.00%
United States Pension Benefits | Pension Benefits | Corporate Debt Securities                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Target plan asset allocations 75.00%       75.00%     75.00%
United States Pension Benefits | 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%       25.00%     25.00%