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Equity and Distributions, Summary of Changes in Outstanding Units (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of changes in outstanding units [Roll Forward]      
Common units issued in connection with employee compensation (in units) 1,176,103    
Common Units (Unrestricted) [Member]      
Summary of changes in outstanding units [Roll Forward]      
Beginning Balance (in units) 2,116,906,120 2,010,592,504 1,933,095,027
Common units issued in connection with ATM program (in units) 21,807,726 87,867,037 25,520,424
Common units issued in connection with DRIP and EUPP (in units) 19,046,019 16,316,534 12,793,913
Common units issued in connection with Step 2 of Oiltanking acquisition (in units)     36,827,517
Common units issued in connection with the vesting and exercise of unit options (in units)     396,158
Common units issued in connection with the vesting of phantom unit awards (in units) 2,485,580 1,761,455 618,395
Common units issues in connection with the vesting of restricted common unit awards 681,044 1,234,502 2,009,970
Forfeiture of restricted common unit awards (in units) 0 0 0
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) (1,027,798) (1,000,619) (683,954)
Common units issued in connection with employee compensation (in units) 1,176,103    
Other (in units) 14,685 134,707 15,054
Ending Balance (in units) 2,161,089,479 2,116,906,120 2,010,592,504
Restricted Common Units [Member]      
Summary of changes in outstanding units [Roll Forward]      
Beginning Balance (in units) 682,294 1,960,520 4,229,790
Common units issued in connection with ATM program (in units) 0 0 0
Common units issued in connection with DRIP and EUPP (in units) 0 0 0
Common units issued in connection with Step 2 of Oiltanking acquisition (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 phantom unit awards (in units) 0 0 0
Common units issues in connection with the vesting of restricted common unit awards (681,044) (1,234,502) (2,009,970)
Forfeiture of restricted common unit awards (in units) (1,250) (43,724) (259,300)
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) 0 0 0
Common units issued in connection with employee compensation (in units) 0    
Other (in units) 0 0 0
Ending Balance (in units) 0 682,294 1,960,520
Common Units [Member]      
Summary of changes in outstanding units [Roll Forward]      
Beginning Balance (in units) 2,117,588,414 2,012,553,024 1,937,324,817
Common units issued in connection with ATM program (in units) 21,807,726 87,867,037 25,520,424
Common units issued in connection with DRIP and EUPP (in units) 19,046,019 16,316,534 12,793,913
Common units issued in connection with Step 2 of Oiltanking acquisition (in units)     36,827,517
Common units issued in connection with the vesting and exercise of unit options (in units)     396,158
Common units issued in connection with the vesting of phantom unit awards (in units) 2,485,580 1,761,455 618,395
Common units issues in connection with the vesting of restricted common unit awards 0 0 0
Forfeiture of restricted common unit awards (in units) (1,250) (43,724) (259,300)
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) (1,027,798) (1,000,619) (683,954)
Common units issued in connection with employee compensation (in units) 1,176,103    
Other (in units) 14,685 134,707 15,054
Ending Balance (in units) 2,161,089,479 2,117,588,414 2,012,553,024