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Advances to and Investments in Unconsolidated Affiliates Investment in Affiliates (Carrying Values) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity in earnings of unconsolidated affiliates |  | $ 119 | $ 302 | $ 344
Advances to and investments in unconsolidated affiliates |  | 3,060 | 3,460 | 2,642
Citrus [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 162 | 148 | 141
Advances to and investments in unconsolidated affiliates |  | 1,867 | 1,876 |
FEP [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates | [1] | (139) | 59 | 55
Advances to and investments in unconsolidated affiliates |  | 4 | 218 |
MEP [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | (6) | 15 | 31
Advances to and investments in unconsolidated affiliates |  | 406 | 429 |
Other Affiliates [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 82 | 76 | 117
Advances to and investments in unconsolidated affiliates |  | 509 | 501 |
White Cliffs |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 20 | 4 | $ 0
Advances to and investments in unconsolidated affiliates |  | $ 274 | $ 436 |
[1] | For the year ended December 31, 2020, equity in earnings (losses) of unconsolidated affiliates includes the impact of non-cash impairments recorded by FEP, which reduced the Partnership’s equity in earnings by $208 million.

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