Long-Term Debt Issuances and Retirements (Details 1) (Williams Partners L.P. [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014
4.3% Senior Unsecured Notes due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt face amount	$ 1,000
Long-term debt interest rate	4.30%
5.4% Senior Unsecured Notes due 2044 [Member]
Debt Instrument [Line Items]
Long-term debt face amount	$ 500
Long-term debt interest rate	5.40%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant