Commitments and Contingencies (Unaudited) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Jul. 31, 2015
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	$ 371,000,000		$ 371,000,000		$ 370,000,000
Recorded Third-Party Environmental Recoveries, Amount	189,000,000		189,000,000		186,000,000
Financial Arrangements
Standby Unused Letters Of Credit and bank guarantees	280,000,000		280,000,000
Surety Bond Outstanding	151,000,000		151,000,000
Operating leases
Rental expense for operating leases, net of immaterial amounts of sublease rental income	68,000,000	$ 76,000,000	$ 159,000,000	$ 157,000,000
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 Facility, Fair Value of Amount Outstanding	0		$ 0
Other Current Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	101,000,000		101,000,000
Other Noncurrent Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	270,000,000		270,000,000
Inventoried Costs [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount	56,000,000		56,000,000
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	771,000,000		771,000,000		812,000,000
Environmental Issue [Member] | Minimum
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 361,000,000		$ 361,000,000		$ 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