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	$ 12,330.2	$ 12,520.8	$ 12,909.9	$ 13,101.3	$ 12,093.3	$ 11,149.3	$ 11,383.1	$ 47,951.2	$ 47,727.0	$ 42,583.1
Operating income	921.0	937.7	884.3	1,032.7	915.5	819.9	774.2	957.7	3,775.7	3,467.3	3,109.2
Net income	681.1	699.2	646.5	806.7	705.7	592.8	553.3	755.3	2,833.5	2,607.1	2,428.0
Net income attributable to limited partners	$ 659.8	$ 691.1	$ 637.7	$ 798.8	$ 698.9	$ 592.0	$ 552.5	$ 753.5	$ 2,787.4	$ 2,596.9	$ 2,419.9
Earnings per unit:
Basic earnings per unit (in dollars per unit)	$ 0.35	$ 0.38	$ 0.35	$ 0.44	$ 0.38	$ 0.33	$ 0.31	$ 0.43	$ 1.51	$ 1.45	$ 1.40
Diluted earnings per unit (in dollars per unit)	$ 0.34	$ 0.37	$ 0.34	$ 0.43	$ 0.37	$ 0.32	$ 0.30	$ 0.41	$ 1.47	$ 1.41	$ 1.35