Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Segment allocation of goodwill

The changes in Dominion Energy’s and Dominion Energy Gas’ carrying amount and segment allocation of goodwill are presented below:

	Power Generation		Gas Infrastructure			Power Delivery		Corporate and Other(1)		Total
(millions)
Dominion Energy
Balance at December 31, 2015(2)		$1,422		$   946			$926		$—		$3,294
Dominion Energy Questar Combination		—		3,105	(3)		—		—		3,105
Balance at December 31, 2016(2)		$1,422		$4,051			$926		$—		$6,399
Dominion Energy Questar Combination		—		6	(3)		—		—		6
Balance at December 31, 2017(2)		$1,422		$4,057			$926		$—		$6,405
Dominion Energy Gas
Balance at December 31, 2015(2)		$     —		$   542			$  —		$—		$   542
No events affecting goodwill		—		—			—		—		—
Balance at December 31, 2016(2)		$     —		$   542			$  —		$—		$   542
No events affecting goodwill		—		—			—		—		—
Balance at December 31, 2017(2)		$     —		$   542			$  —		$—		$   542

(1) Goodwill recorded at the Corporate and Other segment is allocated to the primary operating segments for goodwill impairment testing purposes.

(2) Goodwill amounts do not contain any accumulated impairment losses.

(3) See Note 3.

Components of intangible assets

The components of intangible assets are as follows:

	2017				2016
At December 31,	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
(millions)
Dominion Energy
Software, licenses and other		$1,043		$358		$955		$337
Virginia Power
Software, licenses and other		$   347		$114		$326		$101
Dominion Energy Gas
Software, licenses and other		$   165		$  56		$147		$  49

Annual amortization expense of intangible assets

Annual amortization expense for these intangible assets is estimated to be as follows:

	2018		2019		2020		2021		2022
(millions)
Dominion Energy	$	78	$	68	$	56	$	43	$	37
Virginia Power	$	30	$	26	$	20	$	13	$	9
Dominion Energy Gas	$	13	$	13	$	12	$	11	$	10