DERIVATIVES (Outstanding Derivative Balances) (Details) - Commodity Risk - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivatives And Hedging Activities [Line Items]
Gross Derivative Assets	$ (77)	$ 5
Derivative Asset, Netting	0	0
Cash Collateral	50	6
Total Derivative Balance, Assets	(27)	11
Current assets – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Assets	51	36
Derivative Asset, Netting	(4)	(6)
Cash Collateral	50	4
Total Derivative Balance, Assets	97	34
Other noncurrent assets – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Assets	118	130
Derivative Asset, Netting	0	(6)
Cash Collateral	0	0
Total Derivative Balance, Assets	118	124
Current liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Liabilities	(37)	(31)
Derivative Liability, Netting	4	6
Cash Collateral	0	2
Total Derivative Balance, Liabilities	(33)	(23)
Noncurrent liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Liabilities	(209)	(130)
Derivative Liability, Netting	0	6
Cash Collateral	0	0
Total Derivative Balance, Liabilities	$ (209)	$ (124)