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CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Stockholders' Equity, Balance $ 2,957us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 2,925us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Unit based compensation 1us-gaap_StockholdersEquityOther  
Net income 31us-gaap_NetIncomeLoss  
Limited partner    
Stockholders' Equity, Balance 2,957us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember		 2,925us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
Unit based compensation 1us-gaap_StockholdersEquityOther
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember		  
Net income 31us-gaap_NetIncomeLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember		  
Accumulated Other Comprehensive Loss    
Stockholders' Equity, Balance 0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Unit based compensation 0us-gaap_StockholdersEquityOther
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		  
Net income $ 0us-gaap_NetIncomeLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember