ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 150	$ 117
Unbilled accounts receivable	128	102
Due from Affiliate, Current	0	1
Other	20	12
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 2	$ 2