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Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2016
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 September 30, 2016
 
 
 
 
 
Beginning balance
$
(241
)
$
535

$
(781
)
$
(6
)
$
(493
)
Other comprehensive income before reclassifications: gains
14

31

15

—

60

Amounts reclassified from AOCI(1): (gains) losses
(34
)
(13
)
9

—

(38
)
Net current-period other comprehensive income (loss)
(20
)
18

24

—

22

Ending balance
$
(261
)
$
553

$
(757
)
$
(6
)
$
(471
)
Three Months Ended September 30, 2015
 
 
 
 
 
Beginning balance
$
(146
)
$
519

$
(754
)
$
(5
)
$
(386
)
Other comprehensive income before reclassifications: gains (losses)
(7
)
(59
)
(9
)
1

(74
)
Amounts reclassified from AOCI(1): (gains) losses
(53
)
(2
)
14

—

(41
)
Net current-period other comprehensive income (loss)
(60
)
(61
)
5

1

(115
)
Ending balance
$
(206
)
$
458

$
(749
)
$
(4
)
$
(501
)
Nine Months Ended September 30, 2016
 
 
 
 
 
Beginning balance
$
(176
)
$
504

$
(797
)
$
(5
)
$
(474
)
Other comprehensive income before reclassifications: gains (losses)
56

72

15

(1
)
142

Amounts reclassified from AOCI(1): (gains) losses
(141
)
(23
)
25

—

(139
)
Net current-period other comprehensive income (loss)
(85
)
49

40

(1
)
3

Ending balance
$
(261
)
$
553

$
(757
)
$
(6
)
$
(471
)
Nine Months Ended September 30, 2015
 
 
 
 
 
Beginning balance
$
(178
)
$
548

$
(782
)
$
(4
)
$
(416
)
Other comprehensive income before reclassifications: gains (losses)
25

(55
)
(6
)
—

(36
)
Amounts reclassified from AOCI(1): (gains) losses
(53
)
(35
)
39

—

(49
)
Net current-period other comprehensive income (loss)
(28
)
(90
)
33

—

(85
)
Ending balance
$
(206
)
$
458

$
(749
)
$
(4
)
$
(501
)
(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 September 30, 2016
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
Commodity contracts
$
(64
)
Operating revenue
 
1

Purchased gas
 
1

Electric fuel and other energy-related purchases
Interest rate contracts
10

Interest and related charges
Foreign currency contracts
(3
)
Other income
 
(55
)
 
Tax
21

Income tax expense
 
$
(34
)
 
Unrealized (gains) and losses on investment securities:
 
Realized (gain) loss on sale of securities
$
(25
)
Other income
Impairment
5

Other income
 
(20
)
 
Tax
7

Income tax expense
 
$
(13
)
 
Unrecognized pension and other postretirement benefit costs:
 
Prior service (credit) costs
$
(4
)
Other operations and maintenance
Actuarial (gains) losses
17

Other operations and maintenance
 
13

 
Tax
(4
)
Income tax expense
 
$
9

 
Three Months Ended September 30, 2015
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
Commodity contracts
$
(87
)
Operating revenue
 
2

Purchased gas
Interest rate contracts
2

Interest and related charges
 
(83
)
 
Tax
30

Income tax expense
 
$
(53
)
 
Unrealized (gains) and losses on investment securities:
 
Realized (gain) loss on sale of securities
$
(18
)
Other income
Impairment
16

Other income
 
(2
)
 
Tax
—

Income tax expense
 
$
(2
)
 
Unrecognized pension and other postretirement benefit costs:
 
Prior service (credit) costs
$
(3
)
Other operations and maintenance
Actuarial (gains) losses
24

Other operations and maintenance
 
21

 
Tax
(7
)
Income tax expense
 
$
14

 
Nine Months Ended September 30, 2016
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
Commodity contracts
$
(266
)
Operating revenue
 
9

Purchased gas
 
8

Electric fuel and other energy-related purchases
Interest rate contracts
21

Interest and related charges
Foreign currency contracts
(1
)
Other income
 
(229
)
 
Tax
88

Income tax expense
 
$
(141
)
 
Unrealized (gains) and losses on investment securities:
 
Realized (gain) loss on sale of securities
$
(55
)
Other income
Impairment
19

Other income
 
(36
)
 
Tax
13

Income tax expense
 
$
(23
)
 
Unrecognized pension and other postretirement benefit costs:
 
Prior service (credit) costs
$
(11
)
Other operations and maintenance
Actuarial (gains) losses
52

Other operations and maintenance
 
41

 
Tax
(16
)
Income tax expense
 
$
25

 
Nine Months Ended September 30, 2015
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
Commodity contracts
$
(103
)
Operating revenue
 
9

Purchased gas
Interest rate contracts
7

Interest and related charges
 
(87
)
 
Tax
34

Income tax expense
 
$
(53
)
 
Unrealized (gains) and losses on investment securities:
 
Realized (gain) loss on sale of securities
$
(82
)
Other income
Impairment
27

Other income
 
(55
)
 
Tax
20

Income tax expense
 
$
(35
)
 
Unrecognized pension and other postretirement benefit costs:
 
Prior service (credit) costs
$
(9
)
Other operations and maintenance
Actuarial (gains) losses
73

Other operations and maintenance
 
64

 
Tax
(25
)
Income tax expense
 
$
39

 
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 September 30, 2016
 
 
 
Beginning balance
$
(34
)
$
(81
)
$
(115
)
Other comprehensive income before reclassifications: gains
9

—

9

Amounts reclassified from AOCI(1): (gains) losses
(1
)
1

—

Net current-period other comprehensive income
8

1

9

Ending balance
$
(26
)
$
(80
)
$
(106
)
Three Months Ended September 30, 2015
 
 
 
Beginning balance
$
(22
)
$
(64
)
$
(86
)
Other comprehensive income before reclassifications: gains
3

—

3

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

(1
)
Net current-period other comprehensive income
1

1

2

Ending balance
$
(21
)
$
(63
)
$
(84
)
Nine Months Ended September 30, 2016
 
 
 
Beginning balance
$
(17
)
$
(82
)
$
(99
)
Other comprehensive income before reclassifications: losses
(6
)
—

(6
)
Amounts reclassified from AOCI(1): (gains) losses
(3
)
2

(1
)
Net current-period other comprehensive income (loss)
(9
)
2

(7
)
Ending balance
$
(26
)
$
(80
)
$
(106
)
Nine Months Ended September 30, 2015
 
 
 
Beginning balance
$
(20
)
$
(66
)
$
(86
)
Other comprehensive income before reclassifications: gains
2

—

2

Amounts reclassified from AOCI(1): (gains) losses
(3
)
3

—

Net current-period other comprehensive income (loss)
(1
)
3

2

Ending balance
$
(21
)
$
(63
)
$
(84
)
(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 September 30, 2016
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
 
Commodity contracts
$
(1
)
Operating revenue
Interest rate contracts
1

Interest and related charges
Foreign currency contracts
(3
)
Other income
 
(3
)
 
Tax
2

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

Other operations and maintenance
 
2

 
Tax
(1
)
Income tax expense
 
$
1

 
Three Months Ended September 30, 2015
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
 
Commodity contracts
$
(3
)
Operating revenue
 
(3
)
 
Tax
1

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

Other operations and maintenance
 
2

 
Tax
(1
)
Income tax expense
 
$
1

 
Nine Months Ended September 30, 2016
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
 
Commodity contracts
$
(6
)
Operating revenue
Interest rate contracts
2

Interest and related charges
Foreign currency contracts
(1
)
Other income
 
(5
)
 
Tax
2

Income tax expense
 
$
(3
)
 
Unrecognized pension and other postretirement benefit costs:
 
 
Actuarial (gains) losses
$
4

Other operations and maintenance
 
4

 
Tax
(2
)
Income tax expense
 
$
2

 
Nine Months Ended September 30, 2015
 
 
Deferred (gains) and losses on derivatives-hedging activities:
 
 
Commodity contracts
$
(4
)
Operating revenue
 
(4
)
 
Tax
1

Income tax expense
 
$
(3
)
 
Unrecognized pension and other postretirement benefit costs:
 
 
Actuarial (gains) losses
$
6

Other operations and maintenance
 
6

 
Tax
(3
)
Income tax expense
 
$
3