Subsequent Event (Details) (USD $)	1 Months Ended	9 Months Ended			1 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended				1 Months Ended		1 Months Ended
	Oct. 31, 2014	Sep. 30, 2014 bbl	Sep. 30, 2013	Oct. 02, 2014 EPO $1.5 Billion 364-Day Credit Agreement [Member]	Oct. 31, 2014 Subsequent Event [Member] EPO Senior Notes LL [Member]	Sep. 30, 2014 Subsequent Event [Member] EPO Senior Notes LL [Member]	Oct. 14, 2014 Subsequent Event [Member] EPO Senior Notes LL [Member]	Oct. 31, 2014 Subsequent Event [Member] EPO Senior Notes MM [Member]	Sep. 30, 2014 Subsequent Event [Member] EPO Senior Notes MM [Member]	Oct. 14, 2014 Subsequent Event [Member] EPO Senior Notes MM [Member]	Oct. 31, 2014 Subsequent Event [Member] EPO Senior Notes NN [Member]	Sep. 30, 2014 Subsequent Event [Member] EPO Senior Notes NN [Member]	Oct. 14, 2014 Subsequent Event [Member] EPO Senior Notes NN [Member]	Oct. 31, 2014 Subsequent Event [Member] EPO Senior Notes II [Member]	Sep. 30, 2014 Subsequent Event [Member] EPO Senior Notes II [Member]	Oct. 14, 2014 Subsequent Event [Member] EPO Senior Notes II [Member]	Oct. 31, 2014 Subsequent Event [Member] EPO Senior Notes LL, MM, NN and II [Member]	Oct. 31, 2014 Subsequent Event [Member] EPO Senior Notes G [Member]	Oct. 31, 2014 Subsequent Event [Member] Oiltanking Partners L.P. [Member]	Oct. 02, 2014 Subsequent Event [Member] Oiltanking Partners L.P. [Member]	Oct. 31, 2014 Subsequent Event [Member] Oiltanking Partners L.P. - Step 1 [Member]	Oct. 02, 2014 Subsequent Event [Member] Oiltanking Partners L.P. - Step 1 [Member] bbl Dock	Oct. 31, 2014 Subsequent Event [Member] Oiltanking Partners L.P. - Step 2 [Member]
Acquisition of Oiltanking [Abstract]
Common units acquired (in units)																					15,899,802
Subordinated units acquired (in units)																					38,899,802
Total consideration for acquisition																			$ 6,000,000,000		$ 4,410,000,000		$ 1,400,000,000
Cash paid to acquire business																					2,210,000,000
Common units issued in connection with acquisition (in units)	54,807,352																				54,807,352
Cash paid to assume notes receivable																					228,000,000
Number of ship and barge docks owned																						12
Storage capacity for crude oil and petroleum products (in Bbls)		220,000,000																				24,000,000
Borrowing capacity of 364-Day Credit Agreement				1,500,000,000
Common units exchanged for each Oiltanking unit (in units)																							1.23
Number of common units issued for each subordinated unit converted (in units)																			1
Number of units owned upon conversion (in units)																			54,799,604
Limited partner interests acquired (in hundredths)																				65.90%
Debt Obligations [Abstract]
Aggregate debt principal issued							800,000,000			1,150,000,000			400,000,000			400,000,000
Interest Rate, stated percentage (in hundredths)							2.55%			3.75%			4.95%			4.85%
Debt issued as percent of principal amount (in hundredths)					99.981%			99.681%			98.356%			100.836%
Maturity Date						Oct. 15, 2019			Feb. 15, 2025			Oct. 15, 2054			Mar. 15, 2044
Borrowings under debt agreements		7,167,500,000	10,139,200,000														2,730,000,000
Repayment of senior notes																		$ 650,000,000