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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [1] |  |  | $ 17,142 |
Total other comprehensive income (loss) |  | $ 13 | $ 53 | 145 | $ 117
Cumulative-effect of changes in accounting principles |  |  |  | 6 |
Ending balance |  | 18,064 |  | 18,064 |
Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [2] |  |  | 12,224 |
Total other comprehensive income (loss) |  |  | 1 | 5 | 5
Cumulative-effect of changes in accounting principles |  |  |  | 3 |
Ending balance |  | 12,497 |  | 12,497 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Total other comprehensive income (loss) |  | (5) | 1 | 6 | 3
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 |  | (248) | (260) | (302) | (280)
Other comprehensive income before reclassifications: gains (losses) |  | (33) | 28 | 78 | 71
Amounts reclassified from AOCI: (gains) losses | [3] | 33 | (18) | 41 | (41)
Net current period other comprehensive income (loss) |  |  | 10 | 119 | 30
Cumulative-effect of changes in accounting principles |  |  |  | (64) |
Less other comprehensive income attributable to noncontrolling interest |  |  |  | 1 |
Ending balance |  | (248) | (250) | (248) | (250)
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (10) | (8) | (12) | (8)
Other comprehensive income before reclassifications: gains (losses) |  | 2 | (3) | 7 | (3)
Amounts reclassified from AOCI: (gains) losses | [3] |  | 1 |  | 1
Total other comprehensive income (loss) |  | 2 | (2) | 7 | (2)
Cumulative-effect of changes in accounting principles |  |  |  | (3) |
Ending balance |  | (8) | (10) | (8) | (10)
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (18) | (22) | (23) | (24)
Other comprehensive income before reclassifications: gains (losses) |  | (20) | 11 | (7) | 2
Amounts reclassified from AOCI: (gains) losses | [3] | 14 | (12) | 11 | (1)
Total other comprehensive income (loss) |  | (6) | (1) | 4 | 1
Cumulative-effect of changes in accounting principles |  |  |  | (5) |
Ending balance |  | (24) | (23) | (24) | (23)
Unrealized Gains and Losses on Investment Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | 3 | 599 | 747 | 569
Other comprehensive income before reclassifications: gains (losses) |  | (5) | 35 | (18) | 93
Amounts reclassified from AOCI: (gains) losses | [3] |  | (4) | 1 | (32)
Net current period other comprehensive income (loss) |  | (5) | 31 | (17) | 61
Cumulative-effect of changes in accounting principles |  |  |  | (732) |
Ending balance |  | (2) | 630 | (2) | 630
Unrealized Gains and Losses on Investment Securities | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | 1 | 58 | 74 | 54
Other comprehensive income before reclassifications: gains (losses) |  | (2) | 4 | (2) | 11
Amounts reclassified from AOCI: (gains) losses | [3] |  | (1) |  | (4)
Total other comprehensive income (loss) |  | (2) | 3 | (2) | 7
Cumulative-effect of changes in accounting principles |  |  |  | (73) |
Ending balance |  | (1) | 61 | (1) | 61
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (1,303) | (1,069) | (1,101) | (1,082)
Amounts reclassified from AOCI: (gains) losses | [3] | 17 | 11 | 42 | 24
Net current period other comprehensive income (loss) |  | 17 | 11 | 42 | 24
Cumulative-effect of changes in accounting principles |  |  |  | (227) |
Ending balance |  | (1,286) | (1,058) | (1,286) | (1,058)
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (95) | (99) | (75) | (99)
Other comprehensive income before reclassifications: gains (losses) |  | 0 | 0 | 0 | 0
Amounts reclassified from AOCI: (gains) losses | [3] | 1 | 2 | 2 | 2
Total other comprehensive income (loss) |  | 1 | 2 | 2 | 2
Cumulative-effect of changes in accounting principles |  |  |  | (21) |
Ending balance |  | (94) | (97) | (94) | (97)
Other Comprehensive Loss From Equity Method Investee |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (3) | (5) | (3) | (6)
Other comprehensive income before reclassifications: gains (losses) |  | 1 | 1 | 1 | 2
Net current period other comprehensive income (loss) |  | 1 | 1 | 1 | 2
Ending balance |  | (2) | (4) | (2) | (4)
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (1,551) | (735) | (659) | (799)
Other comprehensive income before reclassifications: gains (losses) |  | (37) | 64 | 61 | 166
Amounts reclassified from AOCI: (gains) losses | [3] | 50 | (11) | 84 | (49)
Total other comprehensive income (loss) |  |  |  | 144 | 117
Net current period other comprehensive income (loss) |  | 13 | 53 | 145 | 117
Cumulative-effect of changes in accounting principles |  |  |  | (1,023) |
Less other comprehensive income attributable to noncontrolling interest |  |  |  | 1 |
Ending balance |  | (1,538) | (682) | (1,538) | (682)
Accumulated Other Comprehensive Income (Loss) | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (9) | 50 | 62 | 46
Other comprehensive income before reclassifications: gains (losses) |  |  | 1 | 5 | 8
Amounts reclassified from AOCI: (gains) losses | [3] |  |  |  | (3)
Total other comprehensive income (loss) |  |  | 1 | 5 | 5
Cumulative-effect of changes in accounting principles |  |  |  | (76) |
Ending balance |  | (9) | 51 | (9) | 51
Accumulated Other Comprehensive Income (Loss) | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (113) | (121) | (98) | (123)
Other comprehensive income before reclassifications: gains (losses) |  | (20) | 11 | (7) | 2
Amounts reclassified from AOCI: (gains) losses | [3] | 15 | (10) | 13 | 1
Total other comprehensive income (loss) |  | (5) | 1 | 6 | 3
Cumulative-effect of changes in accounting principles |  |  |  | (26) |
Ending balance |  | $ (118) | $ (120) | $ (118) | $ (120)
[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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