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NET INCOME PER COMMON UNIT (Details 2) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income per common unit    
Net income attributable to controlling interests $ 57us-gaap_NetIncomeLoss $ 57us-gaap_NetIncomeLoss
Net income allocated to General Partner, including incentive distribution rights (IDRs) 1us-gaap_NetIncomeLossAllocatedToGeneralPartners 1us-gaap_NetIncomeLossAllocatedToGeneralPartners
Net income allocable to common units $ 56us-gaap_NetIncomeLossAllocatedToLimitedPartners $ 56us-gaap_NetIncomeLossAllocatedToLimitedPartners
Weighted average common units outstanding (millions) - basic (in units) 63.6us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding 62.3us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding
Weighted average common units outstanding (millions) - diluted (in units) 63.6us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted 62.3us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted
Net income per common unit - basic (in dollars per unit) $ 0.88us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 0.90us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Net income per common unit - diluted (in dollars per unit) $ 0.88us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted $ 0.90us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted