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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, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | [1] | $ 20,107 |
Ending balance |  | 26,909 |
Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | [2] | 13,047 |
Ending balance |  | 12,944 |
Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (235) | $ (302)
Other comprehensive income before reclassifications: gains (losses) |  | (24) | 111
Amounts reclassified from AOCI: (gains) losses | [3] | (31) | 8
Net current period other comprehensive income (loss) |  | (55) | 119
Cumulative-effect of changes in accounting principle |  |  | (64)
Less other comprehensive income attributable to noncontrolling interest |  |  | 1
Ending balance |  | (290) | (248)
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (13) | (12)
Other comprehensive income before reclassifications: gains (losses) |  | (7) | 5
Net current period other comprehensive income (loss) |  | (7) | 5
Cumulative-effect of changes in accounting principle |  |  | (3)
Ending balance |  | (20) | (10)
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (25) | (23)
Other comprehensive income before reclassifications: gains (losses) |  | (27) | 13
Amounts reclassified from AOCI: (gains) losses | [3] | 4 | (3)
Net current period other comprehensive income (loss) |  | (23) | 10
Cumulative-effect of changes in accounting principle |  |  | (5)
Ending balance |  | (48) | (18)
Unrealized Gains and Losses on Investment Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 2 | 747
Other comprehensive income before reclassifications: gains (losses) |  | 16 | (13)
Amounts reclassified from AOCI: (gains) losses | [3] |  | 1
Net current period other comprehensive income (loss) |  | 16 | (12)
Cumulative-effect of changes in accounting principle |  |  | (732)
Ending balance |  | 18 | 3
Unrealized Gains and Losses on Investment Securities | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | 1 | 74
Other comprehensive income before reclassifications: gains (losses) |  | 2 |
Net current period other comprehensive income (loss) |  | 2 |
Cumulative-effect of changes in accounting principle |  |  | (73)
Ending balance |  | 3 | 1
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (1,465) | (1,101)
Amounts reclassified from AOCI: (gains) losses | [3] | 8 | 25
Net current period other comprehensive income (loss) |  | 8 | 25
Cumulative-effect of changes in accounting principle |  |  | (227)
Ending balance |  | (1,457) | (1,303)
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (144) | (75)
Amounts reclassified from AOCI: (gains) losses | [3] | 1 | 1
Net current period other comprehensive income (loss) |  | 1 | 1
Cumulative-effect of changes in accounting principle |  |  | (21)
Ending balance |  | (143) | (95)
Other Comprehensive Loss From Equity Method Investee |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (2) | (3)
Ending balance |  | (2) | (3)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (1,700) | (659)
Other comprehensive income before reclassifications: gains (losses) |  | (8) | 98
Amounts reclassified from AOCI: (gains) losses | [3] | (23) | 34
Net current period other comprehensive income (loss) |  | (31) | 132
Cumulative-effect of changes in accounting principle |  |  | (1,023)
Less other comprehensive income attributable to noncontrolling interest |  |  | 1
Ending balance |  | (1,731) | (1,551)
Accumulated Other Comprehensive Income (Loss) | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (12) | 62
Other comprehensive income before reclassifications: gains (losses) |  | (5) | 5
Net current period other comprehensive income (loss) |  | (5) | 5
Cumulative-effect of changes in accounting principle |  |  | (76)
Ending balance |  | (17) | (9)
Accumulated Other Comprehensive Income (Loss) | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance |  | (169) | (98)
Other comprehensive income before reclassifications: gains (losses) |  | (27) | 13
Amounts reclassified from AOCI: (gains) losses | [3] | 5 | (2)
Net current period other comprehensive income (loss) |  | (22) | 11
Cumulative-effect of changes in accounting principle |  |  | (26)
Ending balance |  | $ (191) | $ (113)
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2018 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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