Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

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

The changes in Dominion Energy 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, 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
Purchase Accounting Adjustment		—		5			—		—		5
Balance at December 31, 2018⁽²⁾	$	1,422	$	4,062		$	926	$	—	$	6,410

Dominion Energy Gas
Balance at December 31, 2016⁽²⁾	$	—	$	542		$	—	$	—	$	542
No events affecting goodwill		—		—			—		—		—
Balance at December 31, 2017⁽²⁾	$	—	$	542		$	—	$	—	$	542
Purchase Accounting Adjustment		—		5			—		—		5
Balance at December 31, 2018⁽²⁾	$	—	$	547		$	—	$	—	$	547

(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.

years. The components of intangible assets are as follows:

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