Commitments and Contingencies (Unaudited) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Jul. 31, 2015
Site Contingency [Line Items]
Low-end of the range of reasonably possible future costs for environmental remediation sites	$ 364,000,000		$ 353,000,000
High-end of the range of reasonably possible future costs for environmental remediation sites	808,000,000		812,000,000
Accrual for Environmental Remediation Costs	377,000,000		370,000,000
Recorded Third-Party Environmental Recoveries, Amount	192,000,000		$ 186,000,000
Financial Arrangements
Standby Unused Letters Of Credit and bank guarantees	238,000,000
Surety Bond Outstanding	150,000,000
Operating leases
Rental expense for operating leases, net of immaterial amounts of sublease rental income	91,000,000	$ 81,000,000
Line of Credit Facility [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	0
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
Other Current Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	110,000,000
Other Noncurrent Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	267,000,000
Inventoried Costs [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount	62,000,000
Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount	$ 130,000,000