CASH DISTRIBUTIONS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
CASH DISTRIBUTIONS
Quarterly cash distributions (in dollars per unit)	$ 0.77	$ 0.75	$ 1.54	$ 1.50
Cash distribution	$ 42		$ 84