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ENVIRONMENTAL MATTERS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Site Contingency [Line Items] |  |  |
Portion Of Environmental Reserve Related To Previously Closed, Impaired, And Divested Sites | $ 8 | $ 8 |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |
Beginning of period | 336 |  |
End of period | 321 | 336 |
Accrual for Environmental Loss Contingencies [Abstract] |  |  |
Accrued Environmental Loss Contingencies, Current | 30 | 35 |
Accrued Environmental Loss Contingencies, Noncurrent | 291 | 301 |
Environmental Costs [Abstract] |  |  |
Cash expenditures related to environmental protection and improvement | 267 | 290 | $ 319
Environmental capital expenditures | 45 | 52 |
Environmental Remediation [Member] |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |
Beginning of period | 308 |  |
Changes in estimates recorded to earnings and other | 11 |  |
Cash reductions | (24) |  |
End of period | $ 295 | 308 |
Expected Payment Period of Environmental Contingencies | approximately 30 years |  |
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 | $ 77 |  |
Accrual for Environmental Loss Contingencies, Significant Assumptions | accrued for estimated future remediation costs at the Shared Sites, over a period of approximately 30 years |  |
Loss Contingency, Estimate of Possible Loss | $ 208 |  |
Environmental ARO [Member] |  |  |
Site Contingency [Line Items] |  |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | 26 | 28 |
Non Environmental ARO [Member] |  |  |
Site Contingency [Line Items] |  |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | 46 | 46 |
Minimum [Member] | Environmental Remediation [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | 295 | 308 |
Maximum [Member] | Environmental Remediation [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | $ 503 | $ 516 |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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