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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

X

- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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