Segment Disclosures Reconciliation of Segment Revenues to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Segment revenues
Service revenues	$ 1,261	$ 1,229
Product sales	727	431
Total revenues	1,988	1,660
Williams Partners [Member]
Segment revenues
Service revenues	1,256	1,222
Product sales	727	428
Other [Member]
Segment revenues
Service revenues	5	7
Product sales	0	3
Intersegment Elimination [Member]
Segment revenues
Service revenues	(3)	(15)
Product sales	0	0
Total revenues	(3)	(15)
Intersegment Elimination [Member] \| Williams Partners [Member]
Segment revenues
Service revenues	0	(4)
Product sales	0	0
Intersegment Elimination [Member] \| Other [Member]
Segment revenues
Service revenues	(3)	(11)
Product sales	0	0
Operating Segments [Member] \| Williams Partners [Member]
Segment revenues
Service revenues	1,256	1,226
Product sales	727	428
Total revenues	1,983	1,654
Operating Segments [Member] \| Other [Member]
Segment revenues
Service revenues	8	18
Product sales	0	3
Total revenues	$ 8	$ 21

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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