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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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The percentage of ownership of an operating facility by an investment in affiliate.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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