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FAIR VALUE MEASUREMENT FAIR VALUE MEASUREMENT (Unobservable inputs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Net realized gains (losses) $ 0 $ 0  
Settlement receipts 0 0  
Crude Oil Options [Member]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   0 $ 316
Net realized gains (losses)     86
Net unrealized gains (losses) related to assets still held at the end of the year     0
Settlement receipts     (402)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs     0
Crude Oil Options [Member] | Sales [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings     87
Crude Oil Options [Member] | Interest Expense [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings     (1)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Settlement receipts     $ (4)
Gulf of Mexico Contingent Consideration [Member]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) (1) 135  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 134 $ 135