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Business Combinations, Pro Forma Earnings Data (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Basic earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
As reported basic units outstanding (in units) |  |  |  |  |  |  |  |  | 1,966.6 | 1,848.7 | 1,788.0
As reported basic earnings per unit (in dollars per unit) | $ 0.34 | $ 0.33 | $ 0.28 | $ 0.33 | $ 0.35 | $ 0.38 | $ 0.35 | $ 0.44 | $ 1.28 | $ 1.51 | $ 1.45
Diluted earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
As reported diluted units outstanding (in units) |  |  |  |  |  |  |  |  | 1,998.6 | 1,895.2 | 1,842.6
As reported diluted earnings per unit (in dollars per unit) | $ 0.34 | $ 0.32 | $ 0.28 | $ 0.32 | $ 0.34 | $ 0.37 | $ 0.34 | $ 0.43 | $ 1.26 | $ 1.47 | $ 1.41
Eagle Ford Midstream Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Pro forma earnings data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 27,148.5 | $ 48,180.4 |
Costs and expenses |  |  |  |  |  |  |  |  | 23,937.1 | 44,583.6 |
Operating income |  |  |  |  |  |  |  |  | 3,585.0 | 3,856.3 |
Net income |  |  |  |  |  |  |  |  | 2,594.4 | 2,896.1 |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 37.2 | 46.1 |
Net income attributable to limited partners |  |  |  |  |  |  |  |  | $ 2,557.2 | $ 2,850.0 |
Basic earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Pro forma basic earnings per unit (in dollars per unit) |  |  |  |  |  |  |  |  | $ 1.30 | $ 1.54 |
Diluted earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Pro forma diluted earnings per unit (in dollars per unit) |  |  |  |  |  |  |  |  | $ 1.28 | $ 1.50 |
Oiltanking Partners L.P. [Member] |  |  |  |  |  |  |  |  |  |  |
Pro forma earnings data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 48,087.5 |
Costs and expenses |  |  |  |  |  |  |  |  |  | 44,509.0 |
Operating income |  |  |  |  |  |  |  |  |  | 3,838.0 |
Net income |  |  |  |  |  |  |  |  |  | 2,877.5 |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 75.0 |
Net income attributable to limited partners |  |  |  |  |  |  |  |  |  | $ 2,802.5 |
Basic earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Pro forma basic units outstanding (in units) |  |  |  |  |  |  |  |  |  | 1,903.5 |
Pro forma basic earnings per unit (in dollars per unit) |  |  |  |  |  |  |  |  |  | $ 1.47 |
Diluted earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Pro forma diluted units outstanding (in units) |  |  |  |  |  |  |  |  |  | 1,950.0 |
Pro forma diluted earnings per unit (in dollars per unit) |  |  |  |  |  |  |  |  |  | $ 1.44 |

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