Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2017

Asset Retirement Obligation Disclosure [Abstract]

Changes to Asset Retirement Obligations

The changes to AROs during 2016 and 2017 were as follows:

	Amount
(millions)
Dominion Energy
AROs at December 31, 2015	$	2,103
Obligations incurred during the period(1)		204
Obligations settled during the period		(171	)
Revisions in estimated cash flows(2)		245
Accretion		104
AROs at December 31, 2016(3)	$	2,485
Obligations incurred during the period		37
Obligations settled during the period		(214	)
Revisions in estimated cash flows		7
Accretion		117
AROs at December 31, 2017(3)	$	2,432
Virginia Power
AROs at December 31, 2015	$	1,247
Obligations incurred during the period		9
Obligations settled during the period		(115	)
Revisions in estimated cash flows(2)		245
Accretion		57
AROs at December 31, 2016	$	1,443
Obligations incurred during the period		11
Obligations settled during the period		(152	)
Revisions in estimated cash flows		(1	)
Accretion		64
AROs at December 31, 2017	$	1,365
Dominion Energy Gas
AROs at December 31, 2015	$	149
Obligations incurred during the period		6
Obligations settled during the period		(8	)
Accretion		9
AROs at December 31, 2016(4)	$	156
Obligations incurred during the period		2
Obligations settled during the period		(7	)
Accretion		9
AROs at December 31, 2017(4)	$	160

(1) Primarily reflects AROs assumed in the Dominion Energy Questar Combination. See Note 3 for further information.

(2) Primarily reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 22 for further information.

(3) Includes $249 million and $263 million reported in other current liabilities at December 31, 2016, and 2017, respectively.

(4) Includes $147 million and $146 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2016 and 2017, respectively.