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Equity (Schedule of Changes in AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | $ 17,142 |
Ending balance |  | 20,107 | $ 17,142
Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 12,224 |
Ending balance |  | 13,047 | 12,224
Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (302) | (280)
Other comprehensive income before reclassifications: gains (losses) |  | 30 | 8
Amounts reclassified from AOCI: (gains) losses | [1] | 102 | (29)
Net current period other comprehensive income (loss) |  | 132 | (21)
Cumulative-effect of changes in accounting principle |  | (64) |
Less other comprehensive income (loss) attributable to noncontrolling interest |  | 1 | 1
Ending balance |  | (235) | (302)
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (12) | (8)
Other comprehensive income before reclassifications: gains (losses) |  | 1 | (5)
Amounts reclassified from AOCI: (gains) losses | [1] | 1 | 1
Net current period other comprehensive income (loss) |  | 2 | (4)
Cumulative-effect of changes in accounting principle |  | (3) |
Ending balance |  | (13) | (12)
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (23) | (24)
Other comprehensive income before reclassifications: gains (losses) |  | (17) | 5
Amounts reclassified from AOCI: (gains) losses | [1] | 20 | (4)
Net current period other comprehensive income (loss) |  | 3 | 1
Cumulative-effect of changes in accounting principle |  | (5) |
Ending balance |  | (25) | (23)
Unrealized Gains and Losses on Investment Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 747 | 569
Other comprehensive income before reclassifications: gains (losses) |  | (18) | 215
Amounts reclassified from AOCI: (gains) losses | [1] | 5 | (37)
Net current period other comprehensive income (loss) |  | (13) | 178
Cumulative-effect of changes in accounting principle |  | (732) |
Ending balance |  | 2 | 747
Unrealized Gains and Losses on Investment Securities | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 74 | 54
Other comprehensive income before reclassifications: gains (losses) |  |  | 24
Amounts reclassified from AOCI: (gains) losses | [1] |  | (4)
Net current period other comprehensive income (loss) |  |  | 20
Cumulative-effect of changes in accounting principle |  | (73) |
Ending balance |  | 1 | 74
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (1,101) | (1,082)
Other comprehensive income before reclassifications: gains (losses) |  | (215) | (69)
Amounts reclassified from AOCI: (gains) losses | [1] | 78 | 50
Net current period other comprehensive income (loss) |  | (137) | (19)
Cumulative-effect of changes in accounting principle |  | (227) |
Ending balance |  | (1,465) | (1,101)
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (75) | (99)
Other comprehensive income before reclassifications: gains (losses) |  | (52) | 20
Amounts reclassified from AOCI: (gains) losses | [1] | 4 | 4
Net current period other comprehensive income (loss) |  | (48) | 24
Cumulative-effect of changes in accounting principle |  | (21) |
Ending balance |  | (144) | (75)
Other Comprehensive Loss From Equity Method Investee |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (3) | (6)
Other comprehensive income before reclassifications: gains (losses) |  | 1 | 3
Net current period other comprehensive income (loss) |  | 1 | 3
Ending balance |  | (2) | (3)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (659) | (799)
Other comprehensive income before reclassifications: gains (losses) |  | (202) | 157
Amounts reclassified from AOCI: (gains) losses | [1] | 185 | (16)
Net current period other comprehensive income (loss) |  | (17) | 141
Cumulative-effect of changes in accounting principle |  | (1,023) |
Less other comprehensive income (loss) attributable to noncontrolling interest |  | 1 | 1
Ending balance |  | (1,700) | (659)
Accumulated Other Comprehensive Income (Loss) | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 62 | 46
Other comprehensive income before reclassifications: gains (losses) |  | 1 | 19
Amounts reclassified from AOCI: (gains) losses | [1] | 1 | (3)
Net current period other comprehensive income (loss) |  | 2 | 16
Cumulative-effect of changes in accounting principle |  | (76) |
Ending balance |  | (12) | 62
Accumulated Other Comprehensive Income (Loss) | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (98) | (123)
Other comprehensive income before reclassifications: gains (losses) |  | (69) | 25
Amounts reclassified from AOCI: (gains) losses | [1] | 24 |
Net current period other comprehensive income (loss) |  | (45) | 25
Cumulative-effect of changes in accounting principle |  | (26) |
Ending balance |  | $ (169) | $ (98)
[1] | See table below for details about these reclassifications.

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