Commitments and Contingencies (Unaudited) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jul. 31, 2015	Aug. 29, 2013
Site Contingency [Line Items]
Low-end of the range of reasonably possible future costs for environmental remediation sites	$ 359	$ 359		$ 359
High-end of the range of reasonably possible future costs for environmental remediation sites	802	802		802
Accrual for Environmental Remediation Costs	374	374		374
Financial Arrangements
Standby Unused Letters Of Credit and bank guarantees	241	241		241
Surety Bond Outstanding	$ 158	158		158
Operating leases
Rental expense for operating leases, net of immaterial amounts of sublease rental income		76	$ 73	157	$ 145
Revolving Credit Facility [Member] | Five Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 1,775
Credit Facility, Covenant Terms, Maximum Debt to Capitalization Ratio	65.00%
Subsequent Event [Member] | Revolving Credit Facility [Member] | Five Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 1,600
Other Current Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	$ 131	131		131
Other Noncurrent Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	243	243		243
Inventoried Costs [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	65	65		65
Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	$ 123	$ 123		$ 123