ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in accumulated other comprehensive loss (AOCL) by components
Partners' Equity at beginning of year	$ 1,151	$ 1,586	$ 1,789
Net other comprehensive loss	2		(1)
Partners' Equity at end of year	1,146	1,151	1,586
Cash flow hedges
Changes in accumulated other comprehensive loss (AOCL) by components
Partners' Equity at beginning of year	(2)	(2)	(1)
Other comprehensive income (loss) before reclassifications	3		(1)
Amounts reclassified from AOCL	(1)
Net other comprehensive loss	$ 2		(1)
Partners' Equity at end of year		$ (2)	$ (2)