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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
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