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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation [Abstract]  
Changes to Asset Retirement Obligations
The changes to AROs during 2015 and 2016 were as follows:
 
 
Amount

(millions)
 
Dominion
 
AROs at December 31, 2014
$
1,714

Obligations incurred during the period(1)
315

Obligations settled during the period
(106
)
Revisions in estimated cash flows(1)
88

Accretion
93

Other
(1
)
AROs at December 31, 2015(2)
$
2,103

Obligations incurred during the period(3)
204

Obligations settled during the period
(171
)
Revisions in estimated cash flows(1)
245

Accretion
104

AROs at December 31, 2016(2)
$
2,485

Virginia Power
 

AROs at December 31, 2014
$
855

Obligations incurred during the period(1)
289

Obligations settled during the period
(39
)
Revisions in estimated cash flows(1)
92

Accretion
50

AROs at December 31, 2015
$
1,247

Obligations incurred during the period
9

Obligations settled during the period
(115
)
Revisions in estimated cash flows(1)
245

Accretion
57

AROs at December 31, 2016
$
1,443

Dominion Gas
 

AROs at December 31, 2014
$
147

Obligations incurred during the period
5

Obligations settled during the period
(6
)
Revisions in estimated cash flows
(5
)
Accretion
9

Other
(1
)
AROs at December 31, 2015(4)
$
149

Obligations incurred during the period
6

Obligations settled during the period
(8
)
Revisions in estimated cash flows
—

Accretion
9

AROs at December 31, 2016(4)
$
156

(1)
Primarily reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 22 for further information.
(2)
Includes $216 million and $249 million reported in other current liabilities at December 31, 2015, and 2016, respectively.
(3)
Primarily reflects AROs assumed in the Dominion Questar Combination. See Note 3 for further information.
(4)
Includes $137 million and $147 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2015 and 2016, respectively.