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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, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 10,190.3 us-gaap_Revenues | $ 12,330.2 us-gaap_Revenues | $ 12,520.8 us-gaap_Revenues | $ 12,909.9 us-gaap_Revenues | $ 13,101.3 us-gaap_Revenues | $ 12,093.3 us-gaap_Revenues | $ 11,149.3 us-gaap_Revenues | $ 11,383.1 us-gaap_Revenues | $ 47,951.2 us-gaap_Revenues | $ 47,727.0 us-gaap_Revenues | $ 42,583.1 us-gaap_Revenues
Operating income | 921.0 us-gaap_OperatingIncomeLoss | 937.7 us-gaap_OperatingIncomeLoss | 884.3 us-gaap_OperatingIncomeLoss | 1,032.7 us-gaap_OperatingIncomeLoss | 915.5 us-gaap_OperatingIncomeLoss | 819.9 us-gaap_OperatingIncomeLoss | 774.2 us-gaap_OperatingIncomeLoss | 957.7 us-gaap_OperatingIncomeLoss | 3,775.7 us-gaap_OperatingIncomeLoss | 3,467.3 us-gaap_OperatingIncomeLoss | 3,109.2 us-gaap_OperatingIncomeLoss
Net income | 681.1 us-gaap_ProfitLoss | 699.2 us-gaap_ProfitLoss | 646.5 us-gaap_ProfitLoss | 806.7 us-gaap_ProfitLoss | 705.7 us-gaap_ProfitLoss | 592.8 us-gaap_ProfitLoss | 553.3 us-gaap_ProfitLoss | 755.3 us-gaap_ProfitLoss | 2,833.5 us-gaap_ProfitLoss | 2,607.1 us-gaap_ProfitLoss | 2,428.0 us-gaap_ProfitLoss
Net income attributable to limited partners | $ 659.8 us-gaap_NetIncomeLoss | $ 691.1 us-gaap_NetIncomeLoss | $ 637.7 us-gaap_NetIncomeLoss | $ 798.8 us-gaap_NetIncomeLoss | $ 698.9 us-gaap_NetIncomeLoss | $ 592.0 us-gaap_NetIncomeLoss | $ 552.5 us-gaap_NetIncomeLoss | $ 753.5 us-gaap_NetIncomeLoss | $ 2,787.4 us-gaap_NetIncomeLoss | $ 2,596.9 us-gaap_NetIncomeLoss | $ 2,419.9 us-gaap_NetIncomeLoss
Earnings per unit: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per unit (in dollars per unit) | $ 0.35 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.38 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.35 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.44 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.38 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.33 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.31 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.43 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.51 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.45 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.40 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Diluted earnings per unit (in dollars per unit) | $ 0.34 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.37 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.34 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.43 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.37 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.32 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.30 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 0.41 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 1.47 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 1.41 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 1.35 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted

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