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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