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Equity and Distributions, Summary of Changes in Outstanding Units (Details)
 3 Months Ended
Mar. 31, 2013
Common Units (Unrestricted) [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Number of units outstanding at December 31, 2012 894,919,851
Common units issued in connection with underwritten offering (in units) 9,200,000
Common units issued in connection with DRIP and EUPP (in units) 1,275,229
Common units issued in connection with the vesting of unit options (in units) 168,628
Common units issued in connection with the vesting of restricted common unit awards (in units) 939,226
Restricted common units awards issued (in units) 0
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) (315,783)
Number of units outstanding at March 31, 2013 906,187,151
Restricted Common Units [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Number of units outstanding at December 31, 2012 3,893,486
Common units issued in connection with underwritten offering (in units) 0
Common units issued in connection with DRIP and EUPP (in units) 0
Common units issued in connection with the vesting of unit options (in units) 0
Common units issued in connection with the vesting of restricted common unit awards (in units) (939,226)
Restricted common units awards issued (in units) 1,723,576
Forfeiture of restricted common unit awards (in units) (59,460)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) 0
Number of units outstanding at March 31, 2013 4,618,376
Common units [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Number of units outstanding at December 31, 2012 898,813,337
Common units issued in connection with underwritten offering (in units) 9,200,000
Common units issued in connection with DRIP and EUPP (in units) 1,275,229
Common units issued in connection with the vesting of unit options (in units) 168,628
Common units issued in connection with the vesting of restricted common unit awards (in units) 0
Restricted common units awards issued (in units) 1,723,576
Forfeiture of restricted common unit awards (in units) (59,460)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) (315,783)
Number of units outstanding at March 31, 2013 910,805,527