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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity in earnings of unconsolidated affiliates | $ 302 | $ 344 | $ 144
Advances to and investments in unconsolidated affiliates | 3,460 | 2,642 | 2,705
Citrus [Member] |  |  |
Equity in earnings of unconsolidated affiliates | 148 | 141 | 144
Advances to and investments in unconsolidated affiliates | 1,876 | 1,737 |
FEP [Member] |  |  |
Equity in earnings of unconsolidated affiliates | 59 | 55 | 53
Advances to and investments in unconsolidated affiliates | 218 | 107 |
MEP [Member] |  |  |
Equity in earnings of unconsolidated affiliates | 15 | 31 | 38
Advances to and investments in unconsolidated affiliates | 429 | 225 |
Other Affiliates [Member] |  |  |
Equity in earnings of unconsolidated affiliates | 80 | 117 | $ (91)
Advances to and investments in unconsolidated affiliates | $ 937 | $ 573 |

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