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Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2016 | Jun. 30, 2016 | Nov. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investments in Unconsolidated Entities |  |  |  |  |  |
Investments in unconsolidated entities |  |  |  | $ 2,343 | $ 2,027 | $ 1,735
Capital contributions to equity method investees excluding capitalized interest |  |  |  | 288 | 245 | 158
Cash received as a return of investment |  |  |  |  | 53 |
Interest expense, capitalized interest |  |  |  | 47 | 57 | $ 48
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets |  |  |  | $ 736 | 760 |
Oxy | BridgeTex Pipeline Company, LLC (BridgeTex) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Interest acquired |  |  | 50.00% |  |  |
Payments to acquire unconsolidated entities |  |  | $ 1,088 |  |  |
Working capital adjustments |  |  | $ 13 |  |  |
BridgeTex Pipeline Company, LLC (BridgeTex) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 1,098 | 1,082 |
Interest acquired |  |  |  |  |  | 50.00%
BridgeTex Pipeline Company, LLC (BridgeTex) | Oxy |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Interest acquired |  |  | 50.00% |  |  |
Total Investments in Unconsolidated Entities |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 22.00% |  |
Investments in unconsolidated entities |  |  |  | $ 11 | 9 |
Caddo Pipeline LLC (Caddo) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 65 | 28 |
Cheyenne Pipeline LLC (Cheyenne) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 30 | 0 |
Ownership percentage sold |  | 50.00% |  |  |  |
Diamond Pipeline LLC (Diamond) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 143 | 38 |
Eagle Ford Pipeline LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 372 | 382 |
Eagle Ford Terminals Corpus Christi LLC (Eagle Ford Terminals) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 53 | 29 |
Frontier Aspen LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 45 | 48 |
Saddlehorn Pipeline Company, LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 40.00% |  |
Investments in unconsolidated entities |  |  |  | $ 213 | 103 |
Settoon Towing, LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 87 | 84 |
STACK Pipeline LLC (STACK) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 14 | 0 |
Ownership percentage sold | 50.00% |  |  |  |  |
White Cliffs Pipeline, LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 36.00% |  |
Investments in unconsolidated entities |  |  |  | $ 212 | 224 |
Equity Method Investees |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Interest expense, capitalized interest |  |  |  | $ 13 | $ 8 |

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- Definition Cash outflow for capital contributions (excluding capitalized interest) subsequent to the initial purchase of interest in equity method investments, to fund the entity's portion of development, construction or capital expansion projects of the equity method investees, net of cash received as a return of investment. + References No definition available. + Details
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