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Equity and Distributions, Summary of Changes in Outstanding Units (Details) - shares | 12 Months Ended
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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

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- Definition Total change in common units due to the vesting and subsequent conversion of other unit awards. + References No definition available. + Details
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- Definition The number of units sold in connection with at-the-market program of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners. + References No definition available. + Details
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