Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

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:

	West		Access Midstream			Northeast G&P			Total
	(Millions)
December 31, 2014	$	45	$	429		$	646		$	1,120
Purchase accounting adjustment	2		23			—			25
Impairment	—		(452		)	(646		)	(1,098		)
December 31, 2015	$	47	$	—		$	—		$	47

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

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

	2015					2014
	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
	(Millions)
Contractual customer relationships	$	10,632	$	(663	)	$	10,761	$	(310	)