Goodwill (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

Goodwill by reportable business segment as of December 31, 2015 and changes in the carrying amount of goodwill as of December 31, 2016 are as follows:

	December 31, 2015			Continuum Acquisition (1)		December 31, 2016
	(in millions)
Natural Gas Distribution	$	746		$	—	$	746
Energy Services	83		(2)	22		105		(2)
Other Operations	11			—		11
Total	$	840		$	22	$	862

(1) See Note 4.

(2) Amount presented is net of the accumulated goodwill impairment charge of $252 million.