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Commitments and Contingencies (Unaudited) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Jul. 31, 2015
Site Contingency [Line Items]            
Accrual for Environmental Remediation Costs $ 394,000,000   $ 394,000,000   $ 370,000,000  
Recorded Third-Party Environmental Recoveries, Amount 196,000,000   196,000,000   186,000,000  
Financial Arrangements            
Standby Unused Letters Of Credit and bank guarantees 286,000,000   286,000,000      
Surety Bond Outstanding 170,000,000   170,000,000      
Operating leases            
Rental expense for operating leases, net of immaterial amounts of sublease rental income 69,000,000 $ 75,000,000 $ 228,000,000 $ 232,000,000    
Line of Credit Facility [Line Items]            
Debt Instrument, Covenant Compliance     the company was in compliance with the covenants under the Credit Agreement      
Line of Credit Outstanding 0   $ 0      
Other Current Liabilities [Member]            
Site Contingency [Line Items]            
Accrual for Environmental Remediation Costs 115,000,000   115,000,000      
Other Noncurrent Liabilities [Member]            
Site Contingency [Line Items]            
Accrual for Environmental Remediation Costs 279,000,000   279,000,000      
Inventoried Costs [Member]            
Site Contingency [Line Items]            
Recorded Third-Party Environmental Recoveries, Amount 63,000,000   63,000,000      
Other Noncurrent Assets [Member]            
Site Contingency [Line Items]            
Recorded Third-Party Environmental Recoveries, Amount 133,000,000   133,000,000      
Environmental Issue [Member] | Maximum            
Site Contingency [Line Items]            
Loss Contingency, Estimate of Possible Loss 796,000,000   796,000,000   812,000,000  
Environmental Issue [Member] | Minimum            
Site Contingency [Line Items]            
Loss Contingency, Estimate of Possible Loss $ 389,000,000   $ 389,000,000   $ 353,000,000  
Revolving Credit Facility [Member] | Five Year Term [Member] [Domain]            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity           $ 1,600,000,000