NET INCOME PER COMMON UNIT (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	May 22, 2013 General Partner	Sep. 30, 2013 General Partner
Common units and interest in the partnership
Additional percentage investment held by General Partner					2.00%	2.00%
Net income attributable to controlling interests	$ 37	$ 48	$ 114	$ 148
Net income allocated to General Partner	(1)	(1)	(2)	(3)
Net income allocated to common units	$ 36	$ 47	$ 112	$ 145
Weighted average common units outstanding (millions) - basic (in units)	62.3	53.5	57.8	53.5
Weighted average common units outstanding (millions) - diluted (in units)	62.3	53.5	57.8	53.5
Net income per common unit - basic (in dollars per unit)	$ 0.58	$ 0.88	$ 1.94	$ 2.71
Net income per common unit - diluted (in dollars per unit)	$ 0.58	$ 0.88	$ 1.94	$ 2.71