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Earnings Per Unit (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income attributable to limited partners $ 552.5 $ 566.3 $ 1,306.0 $ 1,217.6
Denominator:        
Distribution-bearing common units outstanding (in units) 889.1 857.9 885.4 857.3
Basic earnings per unit:        
Net income attributable to limited partners, basic (in dollars per unit) $ 0.62 $ 0.66 $ 1.48 $ 1.42
Numerator:        
Net income attributable to limited partners $ 552.5 $ 566.3 $ 1,306.0 $ 1,217.6
Denominator:        
Distribution-bearing common units outstanding (in units) 889.1 857.9 885.4 857.3
Class B units (in units) 4.5 4.5 4.5 4.5
Designated Units (in units) 23.7 26.1 23.7 26.1
Incremental option units (in units) 1.2 1.4 1.2 1.4
Total (in units) 918.5 889.9 914.8 889.3
Diluted earnings per unit:        
Net income attributable to limited partners, diluted (in dollars per unit) $ 0.60 $ 0.64 $ 1.43 $ 1.37