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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Jun. 30, 2016 | Aug. 31, 2009 | Aug. 28, 2009
Merey Sweeny [Member] |  |  |  |
Variable interest entities VIEs (Textual) [Abstract] |  |  |  |
Additional ownership interest acquired in MSLP that is in dispute |  |  | 50.00% | 50.00%
Maximum exposure under debt guarantee |  | $ 179 |  |
Merey Sweeny [Member] | MSLP 8.85% Senior Notes [Member] | Guarantees of Joint Venture Debt [Member] |  |  |  |
Variable interest entities VIEs (Textual) [Abstract] |  |  |  |
Debt guarantee to lender of 8.85% senior notes issued by MSLP, percentage | 100.00% |  |  |
Stated interest rate of debt issued, percentage | 8.85% |  |  |
Maximum exposure under debt guarantee |  | $ 140 |  |
Dakota Access LLC [Member] |  |  |  |
Variable interest entities VIEs (Textual) [Abstract] |  |  |  |
Percentage of ownership interest |  | 25.00% |  |
Energy Transfer Crude Oil Company, LLC [Member] |  |  |  |
Variable interest entities VIEs (Textual) [Abstract] |  |  |  |
Percentage of ownership interest |  | 25.00% |  |
DAPL And ETCOP [Member] |  |  |  |
Variable interest entities VIEs (Textual) [Abstract] |  |  |  |
Book value of investment |  | $ 520 |  |
Loans and leases receivable, related parties |  | $ 107 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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