Commitments and Contingencies (Policies)

12 Months Ended

Dec. 31, 2015

Schedule of Significant Accounting Policies [Line Items]

Environmental Costs, Policy [Policy Text Block]

Environmental Liabilities

We recognize environmental liabilities when a loss is probable and reasonably estimable. Such accruals are estimated based on currently available information, existing technology and enacted laws and regulations. Such estimates are based primarily upon the estimated cost of investigation and remediation required and the likelihood that other potentially responsible parties will be able to fulfill their commitments at the sites where we may be jointly and severally liable with such parties. We regularly evaluate and revise estimates for environmental obligations based on expenditures against established reserves and the availability of additional information.

Energy Segment [Member]

Schedule of Significant Accounting Policies [Line Items]

Environmental Costs, Policy [Policy Text Block]

Environmental expenditures are capitalized when such expenditures are expected to result in future economic benefits. For the years ended December 31, 2015, 2014 and 2013, capital expenditures were approximately $36 million, $101 million and $111 million, respectively, and were incurred to improve the environmental compliance and efficiency of the operations.