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RESERVE ROLLFORWARDS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Deferred Tax Assets, Valuation Allowance $ 453 $ 487 [1]  
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 1,177 1,063 $ 919
Charges (Credits) to Cost and Expense (100) 132 163
Charged to Other Accounts (14) 1 11
Deductions 16 19 30
Ending Balance 1,047 1,177 1,063
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 11 12 10
Charges (Credits) to Cost and Expense 0 0 3
Charged to Other Accounts 0 0 0
Deductions 0 1 1
Ending Balance 11 11 12
LIFO Inventory [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 337 288 264
Charges (Credits) to Cost and Expense (89) 44 24
Charged to Other Accounts 0 5 0
Deductions 0 0 0
Ending Balance 248 337 288
Non-environmental asset retirement obligation Costs [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 46 49 46
Charges (Credits) to Cost and Expense 2 (2) 2
Charged to Other Accounts 0 0 1
Deductions 0 1 0
Ending Balance 48 46 49
Environmental Contingencies [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 296 304 321
Charges (Credits) to Cost and Expense 7 9 8
Charged to Other Accounts 0 0 4
Deductions 16 17 29
Ending Balance 287 296 304
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
Movement In Valuation Allowances And Reserves Roll Forward      
Beginning Balance 487 [2] 410 278
Charges (Credits) to Cost and Expense (20) 81 [2] 126
Charged to Other Accounts (14) (4) [2] 6
Deductions 0 0 [2] 0
Ending Balance $ 453 487 [2] $ 410
Previously Reported [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Deferred Tax Assets, Valuation Allowance   $ 466  
[1]
Revised from Note 7, "Income Taxes", to the Company's 2018 Annual Report on Form 10-K, which reported net operating loss carryforwards as $708 million, valuation allowance as $466 million, and investments as $(274) million.
[2]
Revised from Note 21, "Reserve Rollforwards", to the Company's 2018 Annual Report on Form 10-K, which reported deferred tax valuation allowance as $466 million.