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Equity and Distributions, Summary of Changes in Outstanding Units (Details)
 6 Months Ended
Jun. 30, 2013
Common Units (Unrestricted) [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Number of units outstanding at December 31, 2012 (in units) 894,919,851
Common units issued in connection with underwritten offering (in units) 9,200,000
Common units issued in connection with our at-the-market program (in units) 3,766,557
Common units issued in connection with our DRIP and EUPP (in units) 2,440,784
Common units issued in connection with the vesting of unit options (in units) 200,882
Common units issued in connection with the vesting of restricted common unit awards (in units) 1,830,010
Restricted common units awards issued (in units) 0
Forfeiture of restricted common unit awards (in units) 0
Acquisition of treasury units in connection with vesting of equity-based awards (in units) (614,191)
Number of units outstanding at June 30, 2013 911,743,893
Restricted Common Units [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Number of units outstanding at December 31, 2012 (in units) 3,893,486
Common units issued in connection with underwritten offering (in units) 0
Common units issued in connection with our at-the-market program (in units) 0
Common units issued in connection with our 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) (1,830,010)
Restricted common units awards issued (in units) 1,748,476
Forfeiture of restricted common unit awards (in units) (120,882)
Acquisition of treasury units in connection with vesting of equity-based awards (in units) 0
Number of units outstanding at June 30, 2013 3,691,070
Common units [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Number of units outstanding at December 31, 2012 (in units) 898,813,337
Common units issued in connection with underwritten offering (in units) 9,200,000
Common units issued in connection with our at-the-market program (in units) 3,766,557
Common units issued in connection with our DRIP and EUPP (in units) 2,440,784
Common units issued in connection with the vesting of unit options (in units) 200,882
Common units issued in connection with the vesting of restricted common unit awards (in units) 0
Restricted common units awards issued (in units) 1,748,476
Forfeiture of restricted common unit awards (in units) (120,882)
Acquisition of treasury units in connection with vesting of equity-based awards (in units) (614,191)
Number of units outstanding at June 30, 2013 915,434,963