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Equity and Distributions, Summary of Changes in Outstanding Units (Details)
 3 Months Ended
Mar. 31, 2014
Common Units (Unrestricted) [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 932,074,401
Common units issued in connection with DRIP and EUPP (in units) 1,338,465
Common units issued in connection with the vesting and exercise of unit options (in units) 485,564
Common units issued in connection with the vesting of restricted common unit awards (in units) 1,239,862
Forfeiture of restricted common unit awards (in units) 0
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) (421,391)
Other (in units) 7,896
Ending Balance (in units) 934,724,797
Restricted Common Units [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 3,610,607
Common units issued in connection with DRIP and EUPP (in units) 0
Common units issued in connection with the vesting and exercise of unit options (in units) 0
Common units issued in connection with the vesting of restricted common unit awards (in units) (1,239,862)
Forfeiture of restricted common unit awards (in units) (86,650)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) 0
Other (in units) 0
Ending Balance (in units) 2,284,095
Common units [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 935,685,008
Common units issued in connection with DRIP and EUPP (in units) 1,338,465
Common units issued in connection with the vesting and exercise of unit options (in units) 485,564
Common units issued in connection with the vesting of restricted common unit awards (in units) 0
Forfeiture of restricted common unit awards (in units) (86,650)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) (421,391)
Other (in units) 7,896
Ending Balance (in units) 937,008,892