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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation [Abstract]  
Changes to Asset Retirement Obligations
The changes to AROs during 2014 and 2015 were as follows:
 
 
Amount

(millions)
 
Dominion
 
AROs at December 31, 2013
$
1,578

Obligations incurred during the period
40

Obligations settled during the period
(82
)
Revisions in estimated cash flows(1)
102

Accretion
81

Other
(5
)
AROs at December 31, 2014(2)
$
1,714

Obligations incurred during the period(3)
315

Obligations settled during the period
(106
)
Revisions in estimated cash flows(3)
88

Accretion
93

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

Virginia Power
 

AROs at December 31, 2013
$
689

Obligations incurred during the period
28

Obligations settled during the period
(1
)
Revisions in estimated cash flows(1)
108

Accretion
37

Other
(6
)
AROs at December 31, 2014
$
855

Obligations incurred during the period(3)
289

Obligations settled during the period
(39
)
Revisions in estimated cash flows(3)
92

Accretion
50

AROs at December 31, 2015
$
1,247

Dominion Gas
 

AROs at December 31, 2013
$
137

Obligations incurred during the period
2

Obligations settled during the period
(8
)
Accretion
8

Other
8

AROs at December 31, 2014(4)
$
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

(1)
Relates primarily to a shift of the delayed planned date on which the DOE is expected to begin accepting spent nuclear fuel.
(2)
Includes $81 million and $216 million reported in other current liabilities at December 31, 2014, and 2015, respectively.
(3)
Primarily reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 22 for further information.
(4)
Includes $140 million and $137 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2014 and 2015, respectively.