DERIVATIVES (Outstanding Derivative Balances) (Details) - Commodity Risk - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivatives And Hedging Activities [Line Items]
Gross Derivative Assets	$ (60)	$ 5
Derivative Asset, Netting	0	0
Cash Collateral	29	6
Total Derivative Balance, Assets	(31)	11
Current assets – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Assets	46	36
Derivative Asset, Netting	(7)	(6)
Cash Collateral	29	4
Total Derivative Balance, Assets	68	34
Other noncurrent assets – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Assets	121	130
Derivative Asset, Netting	0	(6)
Cash Collateral	0	0
Total Derivative Balance, Assets	121	124
Current liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Liabilities	(44)	(31)
Derivative Liability, Netting	7	6
Cash Collateral	0	2
Total Derivative Balance, Liabilities	(37)	(23)
Noncurrent liabilities – other
Derivatives And Hedging Activities [Line Items]
Gross Derivative Liabilities	(183)	(130)
Derivative Liability, Netting	0	6
Cash Collateral	0	0
Total Derivative Balance, Liabilities	$ (183)	$ (124)