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Accumulated Other Comprehensive Income (Schedule of Changes in AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | [1] | $ 17,142 |
Cumulative-effect of changes in accounting principles |  | 6 |
Ending balance |  | 17,689 |
Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | [2] | 12,224 |
Cumulative-effect of changes in accounting principles |  | 3 |
Ending balance |  | 12,262 |
Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Cumulative-effect of changes in accounting principles |  | 3 |
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) |  | 111 | 43
Amounts reclassified from AOCI: (gains) losses | [3] | 8 | (23)
Net current period other comprehensive income (loss) |  | 119 | 20
Cumulative-effect of changes in accounting principles |  | (64) |
Less other comprehensive income attributable to noncontrolling interest |  | 1 |
Ending balance |  | (248) | (260)
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) |  | 5 |
Net current period other comprehensive income (loss) |  | 5 |
Cumulative-effect of changes in accounting principles |  | (3) |
Ending balance |  | (10) | (8)
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) |  | 13 | (9)
Amounts reclassified from AOCI: (gains) losses | [3] | (3) | 11
Net current period other comprehensive income (loss) |  | 10 | 2
Cumulative-effect of changes in accounting principles |  | (5) | 0
Ending balance |  | (18) | (22)
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) |  | (13) | 58
Amounts reclassified from AOCI: (gains) losses | [3] | 1 | (28)
Net current period other comprehensive income (loss) |  | (12) | 30
Cumulative-effect of changes in accounting principles |  | (732) |
Ending balance |  | 3 | 599
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) |  |  | 7
Amounts reclassified from AOCI: (gains) losses | [3] |  | (3)
Net current period other comprehensive income (loss) |  |  | 4
Cumulative-effect of changes in accounting principles |  | (73) |
Ending balance |  | 1 | 58
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (1,101) | (1,082)
Amounts reclassified from AOCI: (gains) losses | [3] | 25 | 13
Net current period other comprehensive income (loss) |  | 25 | 13
Cumulative-effect of changes in accounting principles |  | (227) |
Ending balance |  | (1,303) | (1,069)
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) |  | 0 | 0
Amounts reclassified from AOCI: (gains) losses | [3] | 1 | 0
Net current period other comprehensive income (loss) |  | 1 | 0
Cumulative-effect of changes in accounting principles |  | (21) | 0
Ending balance |  | (95) | (99)
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
Net current period other comprehensive income (loss) |  |  | 1
Ending balance |  | (3) | (5)
Total |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (659) | (799)
Other comprehensive income before reclassifications: gains (losses) |  | 98 | 102
Amounts reclassified from AOCI: (gains) losses | [3] | 34 | (38)
Net current period other comprehensive income (loss) |  | 132 | 64
Cumulative-effect of changes in accounting principles |  | (1,023) |
Less other comprehensive income attributable to noncontrolling interest |  | 1 |
Ending balance |  | (1,551) | (735)
Total | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 62 | 46
Other comprehensive income before reclassifications: gains (losses) |  | 5 | 7
Amounts reclassified from AOCI: (gains) losses | [3] |  | (3)
Net current period other comprehensive income (loss) |  | 5 | 4
Cumulative-effect of changes in accounting principles |  | (76) |
Ending balance |  | (9) | 50
Total | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (98) | (123)
Other comprehensive income before reclassifications: gains (losses) |  | 13 | (9)
Amounts reclassified from AOCI: (gains) losses | [3] | (2) | 11
Net current period other comprehensive income (loss) |  | 11 | 2
Cumulative-effect of changes in accounting principles |  | (26) | 0
Ending balance |  | $ (113) | $ (121)
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | See table below for details about these reclassifications.

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