Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information (Unaudited) [Abstract]
Revenues	$ 6,478.8	$ 5,920.4	$ 5,617.8	$ 5,005.3	$ 6,155.0	$ 6,307.9	$ 7,092.5	$ 7,472.5	$ 23,022.3	$ 27,027.9	$ 47,951.2
Operating income	923.2	905.0	836.9	915.6	934.5	909.4	800.3	896.0	3,580.7	3,540.2	3,775.7
Net income	669.7	643.1	570.0	670.2	693.5	657.7	556.6	650.6	2,553.0	2,558.4	2,833.5
Net income attributable to limited partners	$ 658.8	$ 634.6	$ 558.5	$ 661.2	$ 684.8	$ 649.3	$ 551.0	$ 636.1	$ 2,513.1	$ 2,521.2	$ 2,787.4
Earnings per unit:
Basic earnings per unit (in dollars per unit)	$ 0.31	$ 0.30	$ 0.27	$ 0.32	$ 0.34	$ 0.33	$ 0.28	$ 0.33	$ 1.20	$ 1.28	$ 1.51
Diluted earnings per unit (in dollars per unit)	$ 0.31	$ 0.30	$ 0.27	$ 0.32	$ 0.34	$ 0.32	$ 0.28	$ 0.32	$ 1.20	$ 1.26	$ 1.47