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Commitments and Contingencies (Unaudited) (Details)
£ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
GBP (£)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Site Contingency [Line Items]              
Accrual for Environmental Remediation Costs           $ 393,000,000 $ 385,000,000
Recorded Third-Party Environmental Recoveries, Amount           202,000,000 195,000,000
Financial Arrangements              
Standby Unused Letters Of Credit and bank guarantees           202,000,000  
Surety Bond Outstanding           198,000,000  
Operating leases              
Rental expense for operating leases, net of immaterial amounts of sublease rental income $ 65,000,000 $ 68,000,000 $ 154,000,000 $ 159,000,000      
Line of Credit Facility [Line Items]              
Debt Instrument, Covenant Compliance     the company was in compliance with all covenants under its credit agreements.        
Other Current Liabilities [Member]              
Site Contingency [Line Items]              
Accrual for Environmental Remediation Costs           124,000,000  
Other Noncurrent Liabilities [Member]              
Site Contingency [Line Items]              
Accrual for Environmental Remediation Costs           269,000,000  
Inventoried Costs [Member]              
Site Contingency [Line Items]              
Recorded Third-Party Environmental Recoveries, Amount           73,000,000  
Other Noncurrent Assets [Member]              
Site Contingency [Line Items]              
Recorded Third-Party Environmental Recoveries, Amount           129,000,000  
Two Year Term [Member] [Domain]              
Line of Credit Facility [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity         £ 120 152,000,000  
Line of Credit Outstanding         £ 110 139,000,000  
Line of Credit Facility, Interest Rate Description     LIBOR plus 1.10 percent        
Five Year Term [Member] [Domain]              
Line of Credit Facility [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity           1,600,000,000  
Line of Credit Outstanding           0  
Environmental Issue [Member] | Maximum              
Site Contingency [Line Items]              
Loss Contingency, Estimate of Possible Loss           782,000,000 774,000,000
Environmental Issue [Member] | Minimum              
Site Contingency [Line Items]              
Loss Contingency, Estimate of Possible Loss           $ 389,000,000 $ 379,000,000