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Subsequent Event (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended
Apr. 10, 2015
Mar. 31, 2015
Dec. 31, 2014
Subsequent Event [Line Items]      
Common units, issued   95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsIssued 95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsIssued
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Common units, issued 4,600,000us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		    
Sale of Stock, Price Per Share $ 44.42us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		    
Partners' Capital Account, Public Sale of Units Net of Offering Costs $ 198us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember