Segment Information Investment in Unconsolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting Information
Investment in unconsolidated affiliates	$ 2,178	$ 2,097
Gathering and Processing
Segment Reporting Information
Investment in unconsolidated affiliates	89	36
Natural Gas Transportation
Segment Reporting Information
Investment in unconsolidated affiliates	980	991
NGL Services
Segment Reporting Information
Investment in unconsolidated affiliates	1,097	1,070
Natural Resources
Segment Reporting Information
Investment in unconsolidated affiliates	$ 12	$ 0

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.

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant