SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Cash and Cash Equivalents Items
Non-cash contribution from affiliate	$ 0	$ 376	$ 0
Notes Receivable, Related Parties, Noncurrent	(1,369)	0	0
non-cash payment from subsidiary of ETP	793	0	0
Accrued Capital Expenditures	21	15	13
Interest Paid, Net	76	75	142
Increase (Decrease) in Notes Receivables	$ 16	$ 0	$ 0