Quarterly report pursuant to Section 13 or 15(d)

Cash Distributions and Net Income (Loss) per Common Unit - Schedule of Partner Distributions Made (Details)

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Cash Distributions and Net Income (Loss) per Common Unit - Schedule of Partner Distributions Made (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Common Units
Sep. 30, 2012
Class B Unit [Member]
May 31, 2012
Class B Unit [Member]
Mar. 31, 2013
Class B Unit [Member]
Mar. 31, 2013
Subordinated Units
Mar. 31, 2013
General Partner [Member]
Distribution Made to Member or Limited Partner [Line Items]                
Number of days after quarter end distribution is paid   $ 45            
Date paid Feb. 14, 2013              
Distribution Made to Member or Limited Partner, Distributions Paid, Per Unit     $ 0.425       $ 0.000  
Total distribution     16,783,000     0 0 342,000
Partner units issued and sold         133.3      
Partner units issued and sold, unit price ($US$ per unit)       $ 15.00        
Proceeds from sale of partnership units         2,000,000,000      
Discount upon issuance of Class B units representating beneficial conversion feature           $ 1,950,000,000