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Equity and Distributions, Summary of Changes in Outstanding Units (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Common Units (Unrestricted) [Member] |  |  |
Summary of changes in outstanding units [Roll Forward] |  |  |
Beginning Balance (in units) | 1,933,095,027 | 1,864,148,802 | 1,789,839,702
Common units issued in connection with underwritten offerings (in units) |  |  | 36,800,000
Common units issued in connection with ATM program (in units) | 25,520,424 | 1,590,334 | 15,249,378
Common units issued in connection with DRIP and EUPP (in units) | 12,793,913 | 9,754,227 | 10,308,254
Common units issued in connection with Oiltanking acquisition (in units) | 36,827,517 | 54,807,352 |
Common units issued in connection with the vesting and exercise of unit options (in units) | 396,158 | 1,014,108 | 401,764
Common units issued in connection with the vesting of phantom unit awards (in units) | 618,395 | 23,311 |
Common units issued in connection with the vesting of restricted common unit awards (in units) | 2,009,970 | 2,634,074 | 3,770,696
Conversion and reclassification of Class B units to common units (in units) |  |  | 9,040,862
Restricted common units awards issued (in units) |  |  | 0
Forfeiture of restricted common unit awards (in units) | 0 | 0 | 0
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) | (683,954) | (894,383) | (1,261,854)
Other (in units) | 15,054 | 17,202 |
Ending Balance (in units) | 2,010,592,504 | 1,933,095,027 | 1,864,148,802
Restricted Common Units [Member] |  |  |
Summary of changes in outstanding units [Roll Forward] |  |  |
Beginning Balance (in units) | 4,229,790 | 7,221,214 | 7,786,972
Common units issued in connection with underwritten offerings (in units) |  |  | 0
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 Oiltanking acquisition (in units) | 0 | 0 |
Common units issued in connection with the vesting and exercise of unit options (in units) | 0 | 0 | 0
Common units issued in connection with the vesting of phantom unit awards (in units) | 0 | 0 |
Common units issued in connection with the vesting of restricted common unit awards (in units) | (2,009,970) | (2,634,074) | (3,770,696)
Conversion and reclassification of Class B units to common units (in units) |  |  | 0
Restricted common units awards issued (in units) |  |  | 3,549,052
Forfeiture of restricted common unit awards (in units) | (259,300) | (357,350) | (344,114)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) | 0 | 0 | 0
Other (in units) | 0 | 0 |
Ending Balance (in units) | 1,960,520 | 4,229,790 | 7,221,214
Common units [Member] |  |  |
Summary of changes in outstanding units [Roll Forward] |  |  |
Beginning Balance (in units) | 1,937,324,817 | 1,871,370,016 | 1,797,626,674
Common units issued in connection with underwritten offerings (in units) |  |  | 36,800,000
Common units issued in connection with ATM program (in units) | 25,520,424 | 1,590,334 | 15,249,378
Common units issued in connection with DRIP and EUPP (in units) | 12,793,913 | 9,754,227 | 10,308,254
Common units issued in connection with Oiltanking acquisition (in units) | 36,827,517 | 54,807,352 |
Common units issued in connection with the vesting and exercise of unit options (in units) | 396,158 | 1,014,108 | 401,764
Common units issued in connection with the vesting of phantom unit awards (in units) | 618,395 | 23,311 |
Common units issued in connection with the vesting of restricted common unit awards (in units) | 0 | 0 | 0
Conversion and reclassification of Class B units to common units (in units) |  |  | 9,040,862
Restricted common units awards issued (in units) |  |  | 3,549,052
Forfeiture of restricted common unit awards (in units) | (259,300) | (357,350) | (344,114)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) | (683,954) | (894,383) | (1,261,854)
Other (in units) | 15,054 | 17,202 |
Ending Balance (in units) | 2,012,553,024 | 1,937,324,817 | 1,871,370,016

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- Definition Total change in restricted units and common units due to the vesting and subsequent conversion of restricted unit awards. + References No definition available. + Details
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