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ENVIRONMENTAL MATTERS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Site Contingency [Line Items] |  |  |
Portion Of Environmental Reserve Related To Previously Closed, Impaired, And Divested Sites | $ 8 | $ 10 |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |
Beginning of period | 345 |  |
End of period | 336 | 345 |
Accrual for Environmental Loss Contingencies [Abstract] |  |  |
Accrued Environmental Loss Contingencies, Current | 35 | 35 |
Accrued Environmental Loss Contingencies, Noncurrent | 301 | 310 |
Environmental Costs [Abstract] |  |  |
Cash expenditures related to environmental protection and improvement | 290 | 319 | $ 285
Cash expenditures for environmental engineering and construction costs | 61 | 79 |
Environmental Remediation [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Range of Possible Loss, Minimum | 308 | 324 |
Loss Contingency, Range of Possible Loss, Maximum | 516 | 548 |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |
Beginning of period | 324 |  |
Changes in estimates recorded to earnings and other | 12 |  |
Cash reductions | (28) |  |
End of period | 308 | 324 |
Shared Sites [Member] |  |  |
Site Contingency [Line Items] |  |  |
Maximum funding required for environmental shared sites | 325 |  |
Amounts paid for Environmental Remediation to Date for Shared Sites | $ 71 |  |
Accrual for Environmental Loss Contingencies, Significant Assumptions | accrued for estimated future remediation costs at the Shared Sites, over a period of thirty years |  |
Loss Contingency, Estimate of Possible Loss | $ 205 |  |
Environmental ARO [Member] |  |  |
Site Contingency [Line Items] |  |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | 28 | 21 |
Non Environmental ARO [Member] |  |  |
Site Contingency [Line Items] |  |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | $ 46 | $ 44 |

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