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Advances to and Investments in Unconsolidated Affiliates Investment in Affiliates (Carrying Values) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Advances to and investments in unconsolidated affiliates	$ 3,040	$ 3,462	$ 3,659
RIGS Haynesville Partnership Co. [Member]
Advances to and investments in unconsolidated affiliates	382	402
Other Affiliates [Member]
Advances to and investments in unconsolidated affiliates	428	466
Citrus [Member]
Advances to and investments in unconsolidated affiliates	1,729	1,739
AmeriGas [Member]
Advances to and investments in unconsolidated affiliates	82	80
FEP [Member]
Advances to and investments in unconsolidated affiliates	101	115
MEP [Member]
Advances to and investments in unconsolidated affiliates	$ 318	$ 660

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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Details

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