SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Cash and Cash Equivalents Items
Non-cash contribution from affiliate	$ 0	$ 0	$ 376
Notes Receivable, Related Parties, Noncurrent	0	(1,369)	0
non-cash payment from subsidiary of ETP	541	793	0
Non-Cash Settlement of Tax Liability	240	0	0
Accrued Capital Expenditures	15	21	15
Interest Paid, Net	75	76	75
Increase (Decrease) in Notes Receivables	$ 40	$ 16	$ 0