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TRANSACTIONS WITH MAJOR CUSTOMERS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Transactions with major customers
Trade accounts receivable	$ 44	$ 40
Total revenues \| Pacific Gas
Transactions with major customers
Percent of consolidate revenue	6.00%
Total revenues \| Customer concentration risk \| Anadarko/Tenaska customer group
Transactions with major customers
Revenues	$ 144	48	$ 48
Total revenues \| Customer concentration risk \| Pacific Gas
Transactions with major customers
Revenues	32	33	$ 36
Accounts receivable and other \| Amounts owed by major customers \| Anadarko Energy Services Company
Transactions with major customers
Trade accounts receivable	$ 4	$ 4