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Acquisitions and Divestitures Business Combinations and Acquisitions of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 01, 2016 | Dec. 31, 2015 | Feb. 27, 2015 | Feb. 13, 2015
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Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 22,162 | $ 22,152 |  | $ 23,790 |  |
BP Terminal Assets [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  |  | $ 349 |  |  |
Current assets |  |  | 2 |  |  |
Property, plant, and equipment |  |  | 396 |  |  |
Deferred charges & other |  |  | 0 |  |  |
Goodwill |  |  | 0 |  |  |
Debt |  |  | 0 |  |  |
Other liabilities |  |  | $ (49) |  |  |
Vopak Terminal Assets [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  |  |  |  | $ 158 |
Current assets |  |  |  |  | 2 |
Property, plant, and equipment |  |  |  |  | 155 |
Deferred charges & other |  |  |  |  | 0 |
Goodwill |  |  |  |  | 6 |
Debt |  |  |  |  | 0 |
Other liabilities |  |  |  |  | $ (5) |
Hiland Partners, LP [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 1,709
Current assets |  |  |  |  |  | 79
Property, plant, and equipment |  |  |  |  |  | 1,492
Deferred charges & other |  |  |  |  |  | 1,498
Goodwill |  |  |  |  |  | 310
Debt |  |  |  |  |  | (1,413)
Other liabilities |  |  |  |  |  | $ (257)

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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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