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RESERVE ROLLFORWARDS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | $ 1,063 | $ 919 | $ 945
Charges (Credits) to Cost and Expense | 111 | 163 | (4)
Charged to Other Accounts | 1 | 11 | 5
Deductions | 19 | 30 | 27
Ending Balance | 1,156 | 1,063 | 919
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 12 | 10 | 13
Charges (Credits) to Cost and Expense | 0 | 3 | (2)
Charged to Other Accounts | 0 | 0 | 0
Deductions | 1 | 1 | 1
Ending Balance | 11 | 12 | 10
LIFO Inventory [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 288 | 264 | 296
Charges (Credits) to Cost and Expense | 44 | 24 | (32)
Charged to Other Accounts | 5 | 0 | 0
Deductions | 0 | 0 | 0
Ending Balance | 337 | 288 | 264
Non-environmental asset retirement obligation Costs [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 49 | 46 | 46
Charges (Credits) to Cost and Expense | (2) | 2 | 0
Charged to Other Accounts | 0 | 1 | 0
Deductions | 1 | 0 | 0
Ending Balance | 46 | 49 | 46
Environmental Contingencies [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 304 | 321 | 336
Charges (Credits) to Cost and Expense | 9 | 8 | 10
Charged to Other Accounts | 0 | 4 | 1
Deductions | 17 | 29 | 26
Ending Balance | 296 | 304 | 321
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |
Beginning Balance | 410 | 278 | 254
Charges (Credits) to Cost and Expense | 60 | 126 | 20
Charged to Other Accounts | (4) | 6 | 4
Deductions | 0 | 0 | 0
Ending Balance | $ 466 | $ 410 | $ 278

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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 Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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