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Equity (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ 3,361 | $ 3,451 | $ 3,088 | $ 3,466 | $ 3,210 | $ 3,179 | $ 2,813 | $ 3,384 | $ 13,366 | [1] | $ 12,586 | [1] | $ 11,737 | [1]
Electric fuel and other energy-related purchases |  |  |  |  |  |  |  |  |  | (2,814) |  | (2,301) |  | (2,333) |
Interest and related charges |  |  |  |  |  |  |  |  |  | (1,493) |  | (1,205) |  | (1,010) |
Other income |  |  |  |  |  |  |  |  |  | 1,021 |  | 358 |  | 429 |
Income from operations including noncontrolling interests before income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 3,129 |  | 3,090 |  | 2,867 |
Income tax expense |  |  |  |  |  |  |  |  |  | 580 |  | (30) |  | 655 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | 1,810 | 2,232 | 1,829 | 1,748 | 1,824 | 2,154 | 1,747 | 1,831 | 7,619 | [2] | 7,556 | [2] | 7,588 | [2]
Electric fuel and other energy-related purchases |  |  |  |  |  |  |  |  |  | (2,318) |  | (1,909) |  | (1,973) |
Interest and related charges |  |  |  |  |  |  |  |  |  | (511) |  | (494) |  | (461) |
Other income |  |  |  |  |  |  |  |  |  | 22 |  | 76 |  | 56 |
Income from operations including noncontrolling interests before income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 1,582 |  | 2,314 |  | 1,945 |
Income tax expense |  |  |  |  |  |  |  |  |  | 300 |  | 774 |  | 727 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ 566 | $ 533 | $ 508 | $ 389 | $ 405 | $ 351 | $ 363 | $ 404 | 1,996 | [3] | 1,523 | [3] | 1,374 | [3]
Net income from discontinued operations | [4] |  |  |  |  |  |  |  |  | 24 |  | 163 |  | 152 |
Interest and related charges | [3] |  |  |  |  |  |  |  |  | (174) |  | (60) |  | (65) |
Other income |  |  |  |  |  |  |  |  |  | 89 |  | 62 |  | 43 |
Income from operations including noncontrolling interests before income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 756 |  | 601 |  | 623 |
Income tax expense |  |  |  |  |  |  |  |  |  | 124 |  | (65) |  | 197 |
Income (loss) including noncontrolling interests, net of tax |  |  |  |  |  |  |  |  |  | 632 |  | 666 |  | $ 426 |
Deferred (gains) and losses on derivatives-hedging activities | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from operations including noncontrolling interests before income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 137 |  | (47) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | (35) |  | 18 |  |  |
Income (loss) including noncontrolling interests, net of tax |  |  |  |  |  |  |  |  |  | 102 |  | (29) |  |  |
Deferred (gains) and losses on derivatives-hedging activities | Commodity contracts | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  | 90 |  | (81) |  |  |
Electric fuel and other energy-related purchases |  |  |  |  |  |  |  |  |  | (14) |  |  |  |  |
Purchased Gas |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Deferred (gains) and losses on derivatives-hedging activities | Interest rate contracts | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 48 |  | 52 |  |  |
Deferred (gains) and losses on derivatives-hedging activities | Foreign currency contracts | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  | 13 |  | (20) |  |  |
Deferred (gains) and losses on derivatives-hedging activities | Virginia Electric and Power Company | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from operations including noncontrolling interests before income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |
Income (loss) including noncontrolling interests, net of tax |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |
Deferred (gains) and losses on derivatives-hedging activities | Virginia Electric and Power Company | Interest rate contracts | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from operations including noncontrolling interests before income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 26 |  | (6) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | (7) |  | 2 |  |  |
Income (loss) including noncontrolling interests, net of tax |  |  |  |  |  |  |  |  |  | 19 |  | (4) |  |  |
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Commodity contracts | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from discontinued operations |  |  |  |  |  |  |  |  |  | 8 |  | 8 |  |  |
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Interest rate contracts | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and related charges |  |  |  |  |  |  |  |  |  | 5 |  | 6 |  |  |
Deferred (gains) and losses on derivatives-hedging activities | Dominion Energy Gas Holdings, LLC | Foreign currency contracts | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  | 13 |  | (20) |  |  |
Unrealized (gains) and losses on investment securities | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (gain) loss on sale of securities |  |  |  |  |  |  |  |  |  | 7 |  | (81) |  |  |
Impairment |  |  |  |  |  |  |  |  |  |  |  | 23 |  |  |
Income from operations including noncontrolling interests before income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 7 |  | (58) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | (2) |  | 21 |  |  |
Income (loss) including noncontrolling interests, net of tax |  |  |  |  |  |  |  |  |  | 5 |  | (37) |  |  |
Unrealized (gains) and losses on investment securities | Virginia Electric and Power Company | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (gain) loss on sale of securities |  |  |  |  |  |  |  |  |  |  |  | (9) |  |  |
Impairment |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Income from operations including noncontrolling interests before income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Income (loss) including noncontrolling interests, net of tax |  |  |  |  |  |  |  |  |  |  |  | (4) |  |  |
Amortization of prior-service costs (credits) | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  | (21) |  | (21) |  |  |
Amortization of actuarial losses | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  | 120 |  | 103 |  |  |
Amortization of actuarial losses | Dominion Energy Gas Holdings, LLC | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  | 6 |  | 6 |  |  |
Unrecognized pension and other postretirement benefit costs | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  |  |  |  |  |  |  |  |  | 99 |  | 82 |  |  |
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  |  |  |  |  |  |  |  | (21) |  | (32) |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax |  |  |  |  |  |  |  |  |  | 78 |  | 50 |  |  |
Unrecognized pension and other postretirement benefit costs | Dominion Energy Gas Holdings, LLC | Amounts reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  |  |  |  |  |  |  |  |  | 6 |  | 6 |  |  |
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  |  |  |  |  |  |  |  | (2) |  | (2) |  |  |
Unrecognized pension and other postretirement benefit costs, net of tax |  |  |  |  |  |  |  |  |  | $ 4 |  | $ 4 |  |  |
[1] | See Note 9 for amounts attributable to related parties.
[2] | See Note 24 for amounts attributable to affiliates.
[3] | See Note 24 for amounts attributable to related parties.
[4] | Includes income tax expense of less than $1 million, $91 million and $80 million in 2018, 2017 and 2016, respectively.

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