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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
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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 |  |  |  |  |

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