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Contingencies and Commitments (Narrative) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Contingencies and Commitments (Textual) [Abstract]    
Total environmental accrual $ 486 $ 485
Expected years to incur a substantial amount of expenditures 30 years  
Performance Guarantee [Member]    
Contingencies and Commitments (Textual) [Abstract]    
Letters of credit and bank guarantees $ 481  
Performance Guarantee [Member] | Revolving Credit Facility [Member]    
Contingencies and Commitments (Textual) [Abstract]    
Letters of credit and bank guarantees $ 51