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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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Financial Information (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 11,072.1 | $ 10,468.7 | $ 9,789.8 | $ 11,252.5 | $ 11,585.7 | $ 11,327.1 | $ 11,216.5 | $ 10,183.7 | $ 42,583.1 | $ 44,313.0 | $ 33,739.3
Operating income | 822.7 | 788.5 | 749.1 | 748.9 | 909.2 | 681.1 | 643.9 | 624.9 | 3,109.2 | 2,859.1 | 2,147.2
Net income | 617.4 | 587.9 | 567.2 | 655.5 | 725.8 | 479.5 | 448.5 | 434.5 | 2,428.0 | 2,088.3 | 1,383.7
Net income attributable to limited partners | $ 615.5 | $ 586.8 | $ 566.3 | $ 651.3 | $ 721.1 | $ 471.4 | $ 433.7 | $ 420.7 | $ 2,419.9 | $ 2,046.9 | $ 320.8
Basic earnings per unit (in dollars per unit) | $ 0.70 | $ 0.68 | $ 0.66 | $ 0.76 | $ 0.85 | $ 0.57 | $ 0.53 | $ 0.52 | $ 2.81 | $ 2.48 | $ 1.17
Diluted earnings per unit (in dollars per unit) | $ 0.68 | $ 0.66 | $ 0.64 | $ 0.73 | $ 0.82 | $ 0.55 | $ 0.51 | $ 0.49 | $ 2.71 | $ 2.38 | $ 1.15

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