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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Equity in earnings of unconsolidated affiliates |  | $ 246 | $ 119 | $ 302
Investments in unconsolidated affiliates |  | 2,947 | 3,060 | 3,460
Citrus [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 157 | 162 | 148
Investments in unconsolidated affiliates |  | 1,792 | 1,867 |
FEP [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates | [1] | 0 | (139) | 59
Investments in unconsolidated affiliates |  | 0 | 4 |
MEP [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | (17) | (6) | 15
Investments in unconsolidated affiliates |  | 378 | 406 |
Other Affiliates [Member] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 106 | 82 | 76
White Cliffs |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 0 | 20 | $ 4
Investments in unconsolidated affiliates |  | 245 | 274 |
Other |  |  |  |
Investments in unconsolidated affiliates |  | $ 532 | $ 509 |
[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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