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Advances to and Investments in Unconsolidated Affiliates Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2018
Impairment of investments in unconsolidated affiliates | $ 313 | $ 308 | $ 0 | $ 313 | $ 308 |
Impairment losses |  |  | 431 | 1,039 | 1,040 |
Advances to and investments in unconsolidated affiliates | $ 2,705 | $ 3,040 | 2,642 | 2,705 | 3,040 |
Equity in earnings of unconsolidated affiliates |  |  | $ 344 | $ 144 | $ 270 |
Citrus [Member] |  |  |  |  |  |
Interest ownership |  |  | 50.00% |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 50.00% |  |  |
FGT [Member] |  |  |  |  |  |
Percentage Ownership Operating Facility |  |  | 100.00% |  |  |
FEP [Member] |  |  |  |  |  |
Interest ownership |  |  | 50.00% |  |  |
Impairment of investments in unconsolidated affiliates |  |  | $ 141 |  |  |
Midcontinent Express Pipeline, LLC [Member] |  |  |  |  |  |
Interest ownership |  |  | 50.00% |  |  |
RIGS Haynesville Partnership Co. [Member] |  |  |  |  |  |
Interest ownership | 49.99% |  |  | 49.99% |  | 50.01%
Impairment losses |  |  | $ 185 |  |  |

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