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TRANSACTIONS WITH MAJOR CUSTOMERS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Transactions with major customers
Trade accounts receivable		$ 36	$ 37
Trade accounts receivable \| Credit Concentration Risk \| Tenaska
Transactions with major customers
Trade accounts receivable	$ 4
Concentration percentage	10.00%
Revenues \| Credit Concentration Risk \| Anadarko/Tenaska customer group
Transactions with major customers
Concentration percentage	36.00%
Revenues	$ 144