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Advances to and Investments in Unconsolidated Affiliates Investment in Affiliates (Carrying Values) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity in earnings of unconsolidated affiliates |  | $ 344 | $ 144 | $ 270
Advances to and investments in unconsolidated affiliates |  | 2,642 | 2,705 | 3,040
Citrus [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 141 | 144 | 102
Advances to and investments in unconsolidated affiliates |  | 1,737 | 1,754 |
FEP [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 55 | 53 | 51
Advances to and investments in unconsolidated affiliates |  | 107 | 121 |
MEP [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 31 | 38 | 40
Advances to and investments in unconsolidated affiliates |  | 225 | 242 |
RIGS Haynesville Partnership Co. [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates | [1] | 3 | (168) | 31
Advances to and investments in unconsolidated affiliates |  | 0 | 28 |
Other Affiliates [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 114 | 77 | $ 46
Advances to and investments in unconsolidated affiliates |  | $ 573 | $ 560 |
[1] | For the year ended December 31, 2017, equity in earnings (losses) of unconsolidated affiliates includes the impact of non-cash impairments recorded by HPC, which reduced the Partnership’s equity in earnings by $185 million.

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