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Equity and Distributions, Summary of Changes in Outstanding Units (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Summary of changes in outstanding units [Roll Forward]        
Beginning Balance (in units) 2,175,951,128 2,171,412,794 2,161,089,479 2,161,089,479
Common units issued in connection with DRIP and EUPP (in units) 6,600,486 3,234,804 6,642,286  
Common units issued in connection with the vesting of phantom unit awards (in units) 151,692 115,115 3,170,861  
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) (41,756) (34,827) (949,778)  
Common units issued in connection with employee compensation (in units)     1,443,586  
Common units issued in connection with land acquisition (in units)   1,223,242   1,223,242
Other (in units)     16,360  
Ending Balance (in units) 2,182,661,550 2,175,951,128 2,171,412,794 2,182,661,550