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DERIVATIVES (Outstanding Derivative Balances) (Details) - Commodity Risk - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Assets $ 14 $ (73)
Derivative Asset, Netting 0 0
Cash Collateral 112 140
Total Derivative Balance, Assets 126 67
Current assets – other    
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Assets 142 33
Derivative Asset, Netting (5) 0
Cash Collateral 95 115
Total Derivative Balance, Assets 232 148
Noncurrent assets – other    
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Assets 131 136
Derivative Asset, Netting 0 0
Cash Collateral 0 0
Total Derivative Balance, Assets 131 136
Current liabilities – other    
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Liabilities (36) (38)
Derivative Liability, Netting 5 0
Cash Collateral 17 15
Total Derivative Balance, Liabilities (14) (23)
Noncurrent liabilities – other    
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Liabilities (223) (204)
Derivative Liability, Netting 0 0
Cash Collateral 0 10
Total Derivative Balance, Liabilities $ (223) $ (194)