Goodwill and Other Intangible assets Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

Changes in the carrying amount of goodwill by reportable segment for the periods indicated are as follows:

	Williams Partners		Access Midstream		Total
	(Millions)
December 31, 2013	$	646	$	—	$	646
Acquisition	—		474		474
December 31, 2014	$	646	$	474	$	1,120

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The gross carrying amount and accumulated amortization of Other intangible assets – net of accumulated amortization at December 31 are as follows:

	2014					2013
	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
	(Millions)
Contractual customer relationships	$	10,763	$	(310	)	$	1,749	$	(105	)