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Quarterly Financial Information (Unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information (Unaudited) [Abstract]                      
Revenues $ 13,101.3 $ 12,093.3 $ 11,149.3 $ 11,383.1 $ 11,072.1 $ 10,468.7 $ 9,789.8 $ 11,252.5 $ 47,727.0 $ 42,583.1 $ 44,313.0
Operating income 915.5 819.9 774.2 957.7 822.7 788.5 749.1 748.9 3,467.3 3,109.2 2,859.1
Net income 705.7 592.8 553.3 755.3 617.4 587.9 567.2 655.5 2,607.1 2,428.0 2,088.3
Net income attributable to limited partners $ 698.9 $ 592.0 $ 552.5 $ 753.5 $ 615.5 $ 586.8 $ 566.3 $ 651.3 $ 2,596.9 $ 2,419.9 $ 2,046.9
Basic earnings per unit (in dollars per unit) $ 0.77 $ 0.66 $ 0.62 $ 0.85 $ 0.70 $ 0.68 $ 0.66 $ 0.76 $ 2.90 $ 2.81 $ 2.48
Diluted earnings per unit (in dollars per unit) $ 0.75 $ 0.64 $ 0.60 $ 0.83 $ 0.68 $ 0.66 $ 0.64 $ 0.73 $ 2.82 $ 2.71 $ 2.38