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Investments in Unconsolidated Entities (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract] |
Investments in and summarized financial information for entities accounted for under the equity method of accounting | Our investments in unconsolidated entities consisted of the following (in millions, except percentage data):
|  |  |  | Ownership Interest at December 31, 2017 |  | December 31,
Entity (1) |  | Type of Operation |  |  | 2017 |  | 2016
Advantage Pipeline Holdings LLC (“Advantage Joint Venture”) |  | Crude Oil Pipeline |  | 50% |  | $ | 69 |  |  | $ | — |
BridgeTex Pipeline Company, LLC (“BridgeTex”) |  | Crude Oil Pipeline |  | 50% |  | 1,093 |  |  | 1,098 |
Butte Pipe Line Company |  | Crude Oil Pipeline |  | N/A |  | — |  |  | 11 |
Caddo Pipeline LLC |  | Crude Oil Pipeline |  | 50% |  | 67 |  |  | 65 |
Cheyenne Pipeline LLC (“Cheyenne”) |  | Crude Oil Pipeline |  | 50% |  | 29 |  |  | 30 |
Diamond Pipeline LLC (“Diamond”) |  | Crude Oil Pipeline |  | 50% |  | 467 |  |  | 143 |
Eagle Ford Pipeline LLC (“Eagle Ford Pipeline”) |  | Crude Oil Pipeline |  | 50% |  | 378 |  |  | 372 |
Eagle Ford Terminals Corpus Christi LLC (“Eagle Ford Terminals”) |  | Crude Oil Terminal and Dock (2) |  | 50% |  | 75 |  |  | 53 |
Frontier Aspen LLC |  | Crude Oil Pipeline |  | N/A |  | — |  |  | 45 |
Midway Pipeline LLC |  | Crude Oil Pipeline |  | 50% |  | 20 |  |  | — |
Saddlehorn Pipeline Company, LLC |  | Crude Oil Pipeline |  | 40% |  | 217 |  |  | 213 |
Settoon Towing, LLC |  | Barge Transportation Services |  | 50% |  | 69 |  |  | 87 |
STACK Pipeline LLC (“STACK”) |  | Crude Oil Pipeline |  | 50% |  | 73 |  |  | 14 |
White Cliffs Pipeline, LLC |  | Crude Oil Pipeline |  | 36% |  | 199 |  |  | 212 |
Total Investments in Unconsolidated Entities |  |  |  |  |  | $ | 2,756 |  |  | $ | 2,343 |
(1) | Except for Eagle Ford Terminals, which is reported in our Facilities segment, the financial results from the entities are reported in our Transportation segment.
(2) | Asset is currently under construction by the entity and has not yet been placed in service.
Combined summarized financial information for all of our unconsolidated entities is shown in the tables below (in millions). None of our unconsolidated entities have noncontrolling interests.
| December 31,
| 2017 |  | 2016
Current assets | $ | 311 |  |  | $ | 303 |
Noncurrent assets | $ | 4,162 |  |  | $ | 3,558 |
Current liabilities | $ | 129 |  |  | $ | 241 |
Noncurrent liabilities | $ | 41 |  |  | $ | 162 |
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Revenues | $ | 938 |  |  | $ | 802 |  |  | $ | 769 |
Operating income | $ | 650 |  |  | $ | 469 |  |  | $ | 441 |
Net income | $ | 640 |  |  | $ | 452 |  |  | $ | 424 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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