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TRANSACTIONS WITH MAJOR CUSTOMERS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Transactions with major customers
Trade accounts receivable	$ 44		$ 37
Revenues \| Credit Concentration Risk \| Anadarko Energy Services Company
Transactions with major customers
Revenues		$ 48
Concentration percentage		10.00%
Revenues \| Credit Concentration Risk \| Anadarko/Tenaska customer group
Transactions with major customers
Revenues	144
Trade accounts receivable \| Credit Concentration Risk \| Anadarko Energy Services Company
Transactions with major customers
Trade accounts receivable		$ 4
Concentration percentage		10.00%
Trade accounts receivable \| Credit Concentration Risk \| Tenaska
Transactions with major customers
Trade accounts receivable	$ 4
Concentration percentage	10.00%