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RESERVE ROLLFORWARDS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance $ 945 $ 1,125 $ 1,090
Charges (Credits) to Cost and Expense (4) (94) 17
Charged to Other Accounts 5 (5) 48
Deductions 27 81 30
Ending Balance 919 945 1,125
Allowance for Doubtful Accounts [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 13 10 12
Charges (Credits) to Cost and Expense (2) 1 1
Charged to Other Accounts 0 2 0
Deductions 1 0 3
Ending Balance 10 13 10
LIFO Inventory [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 296 462 506
Charges (Credits) to Cost and Expense (32) (166) (44)
Charged to Other Accounts 0 0 0
Deductions 0 0 0
Ending Balance 264 296 462
Non-environmental asset retirement obligation Costs [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 46 44 0
Charges (Credits) to Cost and Expense 0 4 0
Charged to Other Accounts 0 0 44
Deductions 0 2 0
Ending Balance 46 46 44
Environmental Contingencies [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 336 345 368
Charges (Credits) to Cost and Expense 10 9 2
Charged to Other Accounts 1 11 2
Deductions 26 29 27
Ending Balance 321 336 345
Valuation Allowance of Deferred Tax Assets [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 254 264 204
Charges (Credits) to Cost and Expense 20 58 58
Charged to Other Accounts 4 (18) 2
Deductions 0 50 0
Ending Balance $ 278 $ 254 $ 264