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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity in earnings of unconsolidated affiliates		$ 119	$ 302	$ 344
Advances to and investments in unconsolidated affiliates		3,060	3,460	2,642
Citrus [Member]
Equity in earnings of unconsolidated affiliates		162	148	141
Advances to and investments in unconsolidated affiliates		1,867	1,876
FEP [Member]
Equity in earnings of unconsolidated affiliates	[1]	(139)	59	55
Advances to and investments in unconsolidated affiliates		4	218
MEP [Member]
Equity in earnings of unconsolidated affiliates		(6)	15	31
Advances to and investments in unconsolidated affiliates		406	429
Other Affiliates [Member]
Equity in earnings of unconsolidated affiliates		82	76	117
Advances to and investments in unconsolidated affiliates		509	501
White Cliffs
Equity in earnings of unconsolidated affiliates		20	4	$ 0
Advances to and investments in unconsolidated affiliates		$ 274	$ 436
[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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