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Equity and Distributions, Summary of Changes in Outstanding Units (Details)
 6 Months Ended
Jun. 30, 2015
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Common Units (Unrestricted) [Member]  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 1,933,095,027
Common units issued in connection with at-the-market program (in units) 23,258,453
Common units issued in connection with DRIP and EUPP (in units) 5,637,275
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) 327,719
Common units issued in connection with the vesting of phantom unit awards (in units) 556,041
Common units issued in connection with the vesting of restricted common unit awards (in units) 1,940,044
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) (662,242)
Other (in units) 15,054
Ending Balance (in units) 2,000,994,888
Restricted Common Units [Member]  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 4,229,790
Common units issued in connection with at-the-market program (in units) 0
Common units issued in connection with DRIP and EUPP (in units) 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
Common units issued in connection with the vesting of restricted common unit awards (in units) (1,940,044)
Forfeiture of restricted common unit awards (in units) (111,250)
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) 2,178,496
Common units [Member]  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 1,937,324,817
Common units issued in connection with at-the-market program (in units) 23,258,453
Common units issued in connection with DRIP and EUPP (in units) 5,637,275
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) 327,719
Common units issued in connection with the vesting of phantom unit awards (in units) 556,041
Common units issued in connection with the vesting of restricted common unit awards (in units) 0
Forfeiture of restricted common unit awards (in units) (111,250)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) (662,242)
Other (in units) 15,054
Ending Balance (in units) 2,003,173,384