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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments in unconsolidated affiliates | $ 3,097 | $ 2,893 | $ 2,947
Equity in earnings of unconsolidated affiliates | 383 | 257 | 246
Other Affiliates [Member] |  |  |
Equity in earnings of unconsolidated affiliates | 103 | 89 | 82
Citrus [Member] |  |  |
Investments in unconsolidated affiliates | 1,811 | 1,800 |
Equity in earnings of unconsolidated affiliates | 146 | 141 | 157
MEP [Member] |  |  |
Investments in unconsolidated affiliates | 332 | 360 |
Equity in earnings of unconsolidated affiliates | 87 | 10 | (17)
White Cliffs |  |  |
Investments in unconsolidated affiliates | 203 | 218 |
Equity in earnings of unconsolidated affiliates | 10 | (8) | 0
Other |  |  |
Investments in unconsolidated affiliates | 684 | 446 |
Explorer |  |  |
Investments in unconsolidated affiliates | 67 | 69 |
Equity in earnings of unconsolidated affiliates | $ 37 | $ 25 | $ 24

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