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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table presents Dominion’s changes in AOCI by component, net of tax: 
 
Deferred Gains and Losses on Derivatives-Hedging Activities
Unrealized Gains and Losses on Investment Securities
Unrecognized Pension and Other Postretirement Benefit Costs
Other Comprehensive Income (Loss) From Equity Method Investee
Total
(millions)
 
 
 
 
 
Three Months Ended March 31, 2017
 
 
 
 
 
Beginning balance
$
(280
)
$
569

$
(1,082
)
$
(6
)
$
(799
)
Other comprehensive income before reclassifications: gains
43

58

—

1

102

Amounts reclassified from AOCI(1): (gains) losses
(23
)
(28
)
13

—

(38
)
Net current-period other comprehensive income
20

30

13

1

64

Ending balance
$
(260
)
$
599

$
(1,069
)
$
(5
)
$
(735
)
Three Months Ended March 31, 2016
 
 
 
 
 
Beginning balance
$
(176
)
$
504

$
(797
)
$
(5
)
$
(474
)
Other comprehensive income before reclassifications: gains
53

15

—

—

68

Amounts reclassified from AOCI(1): (gains) losses
(63
)
(2
)
8

—

(57
)
Net current-period other comprehensive income (loss)
(10
)
13

8

—

11

Ending balance
$
(186
)
$
517

$
(789
)
$
(5
)
$
(463
)
(1) See table below for details about these reclassifications.
Reclassification out of Accumulated Other Comprehensive Income
The following table presents Dominion’s reclassifications out of AOCI by component: 
Details About AOCI Components
Amounts Reclassified From AOCI
Affected Line Item in the Consolidated Statements of Income
(millions)
 
 
Three Months Ended March 31, 2017
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
Commodity contracts
$
(62
)
Operating revenue
 
(1
)
Purchased gas
 
1

Electric fuel and other energy-related purchases
Interest rate contracts
11

Interest and related charges
Foreign currency contracts
14

Other income
 
(37
)
 
Tax
14

Income tax expense
 
$
(23
)
 
Unrealized (gains) and losses on investment securities:
 
Realized (gain) loss on sale of securities
$
(53
)
Other income
Impairment
9

Other income
 
(44
)
 
Tax
16

Income tax expense
 
$
(28
)
 
Unrecognized pension and other postretirement benefit costs:
 
Prior service (credit) costs
$
(4
)
Other operations and maintenance
Actuarial (gains) losses
25

Other operations and maintenance
 
21

 
Tax
(8
)
Income tax expense
 
$
13

 
Three Months Ended March 31, 2016
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
Commodity contracts
$
(114
)
Operating revenue
 
6

Purchased gas
 
3

Electric fuel and other energy-related purchases
Interest rate contracts
3

Interest and related charges
 
(102
)
 
Tax
39

Income tax expense
 
$
(63
)
 
Unrealized (gains) and losses on investment securities:
 
Realized (gain) loss on sale of securities
$
(10
)
Other income
Impairment
7

Other income
 
(3
)
 
Tax
1

Income tax expense
 
$
(2
)
 
Unrecognized pension and other postretirement benefit costs:
 
Prior service (credit) costs
$
(3
)
Other operations and maintenance
Actuarial (gains) losses
17

Other operations and maintenance
 
14

 
Tax
(6
)
Income tax expense
 
$
8

 
Dominion Gas Holdings, LLC  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table presents Dominion Gas’ changes in AOCI by component, net of tax: 
 
Deferred Gains and Losses on Derivatives-Hedging Activities
Unrecognized Pension and Other Postretirement Benefit Costs
Total
(millions)
 
 
 
Three Months Ended March 31, 2017
 
 
 
Beginning balance
$
(24
)
$
(99
)
$
(123
)
Other comprehensive income before reclassifications: losses
(9
)
—

(9
)
Amounts reclassified from AOCI(1): losses
11

—

11

Net current-period other comprehensive income
2

—

2

Ending balance
$
(22
)
$
(99
)
$
(121
)
Three Months Ended March 31, 2016
 
 
 
Beginning balance
$
(17
)
$
(82
)
$
(99
)
Other comprehensive income before reclassifications: losses
(6
)
—

(6
)
Amounts reclassified from AOCI(1): gains
(2
)
—

(2
)
Net current-period other comprehensive loss
(8
)
—

(8
)
Ending balance
$
(25
)
$
(82
)
$
(107
)
(1)
See table below for details about these reclassifications.
Reclassification out of Accumulated Other Comprehensive Income
The following table presents Dominion Gas' reclassifications out of AOCI by component: 
Details About AOCI Components
Amounts Reclassified From AOCI
Affected Line Item in the Consolidated Statements of Income
(millions)
 
 
Three Months Ended March 31, 2017
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
 
Commodity contracts
$
3

Operating revenue
Interest rate contracts
1

Interest and related charges
Foreign currency contracts
14

Other income
 
18

 
Tax
(7
)
Income tax expense
 
$
11

 
Unrecognized pension and other postretirement benefit costs:
 
 
Actuarial (gains) losses
$
1

Other operations and maintenance
 
1

 
Tax
(1
)
Income tax expense
 
$
—

 
Three Months Ended March 31, 2016
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
 
Commodity contracts
$
(4
)
Operating revenue
 
(4
)
 
Tax
2

Income tax expense
 
$
(2
)
 
Unrecognized pension and other postretirement benefit costs:
 
 
Actuarial (gains) losses
$
1

Other operations and maintenance
 
1

 
Tax
(1
)
Income tax expense
 
$
—