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RESERVE ROLLFORWARDS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | $ 1,125 | $ 1,090 | $ 1,122
Charged to Cost and Expense | (150) | (47) | 10
Charged to Other Accounts | 51 | 112 | 1
Deductions | 81 | 30 | 43
Ending Balance | 945 | 1,125 | 1,090
Allowance for Doubtful Accounts [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 10 | 12 | 8
Charged to Cost and Expense | 1 | 1 | 5
Charged to Other Accounts | 2 | 0 | 0
Deductions | 0 | 3 | 1
Ending Balance | 13 | 10 | 12
LIFO Inventory [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 462 | 506 | 505
Charged to Cost and Expense | (166) | (44) | 1
Charged to Other Accounts | 0 | 0 | 0
Deductions | 0 | 0 | 0
Ending Balance | 296 | 462 | 506
Non-environmental asset retirement obligation Costs [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 44 | 0 |
Charged to Cost and Expense | 4 | 0 |
Asset Retirement Obligation, Liabilities Incurred | 0 | 44 |
Deductions | 2 | 0 |
Ending Balance | 46 | 44 | 0
Environmental Contingencies [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 345 | 368 | 394
Charged to Cost and Expense | 9 | 2 | 4
Charged to Other Accounts | 11 | 2 | 1
Deductions | 29 | 27 | 31
Ending Balance | 336 | 345 | 368
Valuation Allowance of Deferred Tax Assets [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 264 | 204 | 215
Charged to Cost and Expense | 2 | (6) | 0
Charged to Other Accounts | 38 | 66 | 0
Deductions | 50 | 0 | 11
Ending Balance | $ 254 | $ 264 | $ 204

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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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