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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity in earnings of unconsolidated affiliates		$ 344	$ 144	$ 270
Advances to and investments in unconsolidated affiliates		2,642	2,705	3,040
Citrus [Member]
Equity in earnings of unconsolidated affiliates		141	144	102
Advances to and investments in unconsolidated affiliates		1,737	1,754
FEP [Member]
Equity in earnings of unconsolidated affiliates		55	53	51
Advances to and investments in unconsolidated affiliates		107	121
MEP [Member]
Equity in earnings of unconsolidated affiliates		31	38	40
Advances to and investments in unconsolidated affiliates		225	242
RIGS Haynesville Partnership Co. [Member]
Equity in earnings of unconsolidated affiliates	[1]	3	(168)	31
Advances to and investments in unconsolidated affiliates		0	28
Other Affiliates [Member]
Equity in earnings of unconsolidated affiliates		114	77	$ 46
Advances to and investments in unconsolidated affiliates		$ 573	$ 560
[1] For the year ended December 31, 2017, equity in earnings (losses) of unconsolidated affiliates includes the impact of non-cash impairments recorded by HPC, which reduced the Partnership’s equity in earnings by $185 million.

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of investment in equity method investee and investment in and advance to affiliate.

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