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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue | [1] | $ (3,088) | $ (2,813) | $ (6,554) | $ (6,197)
Interest and related charges |  | 361 | 308 | 675 | 600
Other income |  | (185) | (108) | (285) | (270)
Income from operations including noncontrolling interests before income tax expense |  | (566) | (553) | (1,227) | (1,502)
Income tax expense |  | 88 | 136 | 223 | 411
Purchased gas |  | 64 | 112 | 404 | 417
Income tax expense |  | (11) | 11 | (14) | 25
Income from continuing operations net of tax | [2] | 33 | (18) | 41 | (41)
Income tax expense |  | (1) | 2 | (1) | 18
Income from continuing operations net of tax | [3] |  | (4) | 1 | (32)
Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue | [4] | (1,829) | (1,747) | (3,577) | (3,578)
Interest and related charges | [4] | 126 | 125 | 258 | 245
Other income |  | (21) | (13) | (24) | (44)
Income from operations including noncontrolling interests before income tax expense |  | (428) | (501) | (663) | (1,065)
Income tax expense |  | 89 | 183 | 140 | 391
Income from continuing operations net of tax | [5] |  | 1 |  | 1
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue | [6] | (459) | (422) | (985) | (912)
Interest and related charges | [6] | 26 | 24 | 51 | 47
Other income |  | (32) | (27) | (65) | (52)
Income from operations including noncontrolling interests before income tax expense |  | (18) | (122) | (236) | (287)
Income tax expense |  | 3 | 45 | 55 | 102
Purchased gas | [6] |  | 38 | 29 | 81
Income tax expense |  | (5) | 7 | (4) |
Income from continuing operations net of tax | [7] | 14 | (12) | 11 | (1)
Electric Fuel and Other Energy-Related Purchases |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Electric fuel and other energy-related purchases |  | 623 | 498 | 1,367 | 1,073
Electric Fuel and Other Energy-Related Purchases | Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Electric fuel and other energy-related purchases | [4] | 508 | 409 | 1,099 | 865
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Income from operations including noncontrolling interests before income tax expense |  | 44 | (29) | 55 | (66)
Income tax expense |  | (11) | 11 | (14) | 25
Income from continuing operations including noncontrolling interests |  | 33 | (18) | 41 | (41)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Income from operations before income tax expense |  |  | 1 |  | 1
Income from continuing operations net of tax |  |  | 1 |  | 1
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Income from operations including noncontrolling interests before income tax expense |  | 19 | (19) | 15 | (1)
Income tax expense |  | (5) | 7 | (4) |
Income from continuing operations including noncontrolling interests |  | 14 | (12) | 11 | (1)
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue |  | 16 | (19) | 28 | (81)
Purchased gas |  |  |  | 2 |
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue |  | 2 | (1) | 5 | 3
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI | Electric Fuel and Other Energy-Related Purchases |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Electric fuel and other energy-related purchases |  |  | (2) | (7) | (2)
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Interest and related charges |  | 12 | 11 | 24 | 23
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Interest and related charges |  |  | 1 |  | 1
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Interest and related charges |  | 1 | 1 | 2 | 2
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | 16 | (19) | 8 | (6)
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | 16 | (19) | 8 | (6)
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Realized (gain) loss on sale of securities |  | 1 | (11) | 2 | (64)
Impairment |  |  | 5 |  | 14
Income from operations including noncontrolling interests before income tax expense |  | 1 | (6) | 2 | (50)
Income tax expense |  | (1) | 2 | (1) | 18
Income from continuing operations including noncontrolling interests |  |  | (4) | 1 | (32)
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Realized (gain) loss on sale of securities |  |  | (1) |  | (7)
Impairment |  |  |  |  | 1
Income from operations before income tax expense |  |  | (1) |  | (6)
Income tax expense |  |  |  |  | 2
Income from continuing operations net of tax |  |  | (1) |  | (4)
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | (5) | (5) | (11) | (9)
Unrecognized pension and other postretirement benefit costs: |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 24 | 21 | 50 | 42
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (7) | (10) | (8) | (18)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 17 | 11 | 42 | 24
Unrecognized pension and other postretirement benefit costs: | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 1 | 2 | 3 | 3
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  |  | (1) | (1)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 1 | 2 | 2 | 2
Amortization of actuarial losses | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | 29 | 26 | 61 | 51
Amortization of actuarial losses | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | $ 1 | $ 2 | $ 3 | $ 3
[1] | See Note 10 for amounts attributable to related parties.
[2] | Net of $(11) million and $11 million tax for the three months ended June 30, 2018 and 2017, respectively, and net of $(14) million and $25 million tax for the six months ended June 30, 2018 and 2017, respectively.
[3] | Net of $(1) million and $2 million tax for the three months ended June 30, 2018 and 2017, respectively, and net of $(1) million and $18 million tax for the six months ended June 30, 2018 and 2017, respectively.
[4] | See Note 18 for amounts attributable to affiliates.
[5] | Net of $— million tax for both the three and six months ended June 30, 2018 and 2017.
[6] | See Note 18 for amounts attributable to related parties.
[7] | Net of $(5) million and $7 million tax for the three months ended June 30, 2018 and 2017, respectively, and net of $(4) million and $— million tax for the six months ended June 30, 2018 and 2017, respectively.

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