ESTIMATES, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND BALANCE SHEET DETAIL Estimates, Significant Accounting Policies and Balance Sheet Detail - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items
non-cash payment from subsidiary of ETP	$ 0	$ 0	$ 541
Non-Cash Settlement of Tax Liability	(19)	(8)	0
Settlement of affiliate liability - related party payables	(12)	0	0
Proceeds from Contributions from Affiliates	(7)	0	0
Deemed contribution (distribution) to Parent	68	0	0
Capital Expenditures Incurred but Not yet Paid	13	11	15
Non-Cash Settlement of Tax Receivable	0	0
Non Cash Equity Distribution			240
Interest Paid, Excluding Capitalized Interest, Operating Activities	43	75	75
Affiliated Entity
Restricted Cash and Cash Equivalents Items
Increase (Decrease) in Notes Receivables	0	18	40
Dividends and Interest Paid	$ 13	$ 0	$ 0