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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  |  |  | $ 20,107 |
Ending balance |  | $ 27,697 |  | 27,697 |
Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [1] |  |  | 13,047 |
Ending balance |  | 12,964 |  | 12,964 |
Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (290) | $ (248) | (235) | $ (302)
Other comprehensive income before reclassifications: gains (losses) |  | (78) | (33) | (102) | 78
Amounts reclassified from AOCI: (gains) losses | [2] | (21) | 33 | (52) | 41
Net current period other comprehensive income (loss) |  | (99) |  | (154) | 119
Cumulative-effect of changes in accounting principle |  |  |  |  | (64)
Less other comprehensive income attributable to noncontrolling interest |  |  |  |  | 1
Ending balance |  | (389) | (248) | (389) | (248)
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (20) | (10) | (13) | (12)
Other comprehensive income before reclassifications: gains (losses) |  | (11) | 2 | (18) | 7
Amounts reclassified from AOCI: (gains) losses | [3] | 1 |  | 1 |
Net current period other comprehensive income (loss) |  | (10) | 2 | (17) | 7
Cumulative-effect of changes in accounting principle |  |  |  |  | (3)
Ending balance |  | (30) | (8) | (30) | (8)
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (48) | (18) | (25) | (23)
Other comprehensive income before reclassifications: gains (losses) |  | (24) | (19) | (51) | (6)
Amounts reclassified from AOCI: (gains) losses | [2] | (2) | 13 | 1 | 11
Net current period other comprehensive income (loss) |  | (26) | (6) | (50) | 5
Cumulative-effect of changes in accounting principle |  |  |  |  | (5)
Less other comprehensive income attributable to noncontrolling interest |  |  |  | (1) | 1
Ending balance |  | (74) | (24) | (74) | (24)
Unrealized Gains and Losses on Investment Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | 18 | 3 | 2 | 747
Other comprehensive income before reclassifications: gains (losses) |  | 13 | (5) | 29 | (18)
Amounts reclassified from AOCI: (gains) losses | [2] | (1) |  | (1) | 1
Net current period other comprehensive income (loss) |  | 12 | (5) | 28 | (17)
Cumulative-effect of changes in accounting principle |  |  |  |  | (732)
Ending balance |  | 30 | (2) | 30 | (2)
Unrealized Gains and Losses on Investment Securities | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | 3 | 1 | 1 | 74
Other comprehensive income before reclassifications: gains (losses) |  | 2 | (2) | 4 | (2)
Amounts reclassified from AOCI: (gains) losses | [3] | (1) |  | (1) |
Net current period other comprehensive income (loss) |  | 1 | (2) | 3 | (2)
Cumulative-effect of changes in accounting principle |  |  |  |  | (73)
Ending balance |  | 4 | (1) | 4 | (1)
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (1,457) | (1,303) | (1,465) | (1,101)
Other comprehensive income before reclassifications: gains (losses) |  | 113 |  | 113 |
Amounts reclassified from AOCI: (gains) losses | [2] | 22 | 17 | 30 | 42
Net current period other comprehensive income (loss) |  | 135 | 17 | 143 | 42
Cumulative-effect of changes in accounting principle |  |  |  |  | (227)
Ending balance |  | (1,322) | (1,286) | (1,322) | (1,286)
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (143) | (95) | (144) | (75)
Other comprehensive income before reclassifications: gains (losses) |  | 29 |  | 29 |
Amounts reclassified from AOCI: (gains) losses | [2] | 2 | 1 | 3 | 2
Net current period other comprehensive income (loss) |  | 31 | 1 | 32 | 2
Cumulative-effect of changes in accounting principle |  |  |  |  | (21)
Ending balance |  | (112) | (94) | (112) | (94)
Other Comprehensive Loss From Equity Method Investee |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (2) | (3) | (2) | (3)
Other comprehensive income before reclassifications: gains (losses) |  |  | 1 |  | 1
Net current period other comprehensive income (loss) |  |  | 1 |  | 1
Ending balance |  | (2) | (2) | (2) | (2)
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (1,731) | (1,551) | (1,700) | (659)
Other comprehensive income before reclassifications: gains (losses) |  | 48 | (37) | 40 | 61
Amounts reclassified from AOCI: (gains) losses | [2] |  | 50 | (23) | 84
Net current period other comprehensive income (loss) |  | 48 | 13 | 17 | 145
Cumulative-effect of changes in accounting principle |  |  |  |  | (1,023)
Less other comprehensive income attributable to noncontrolling interest |  |  |  |  | 1
Ending balance |  | (1,683) | (1,538) | (1,683) | (1,538)
Accumulated Other Comprehensive Income (Loss) | Virginia Electric and Power Company |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (17) | (9) | (12) | 62
Other comprehensive income before reclassifications: gains (losses) |  | (9) |  | (14) | 5
Net current period other comprehensive income (loss) |  | (9) |  | (14) | 5
Cumulative-effect of changes in accounting principle |  |  |  |  | (76)
Ending balance |  | (26) | (9) | (26) | (9)
Accumulated Other Comprehensive Income (Loss) | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (191) | (113) | (169) | (98)
Other comprehensive income before reclassifications: gains (losses) |  | 5 | (19) | (22) | (6)
Amounts reclassified from AOCI: (gains) losses | [2] |  | 14 | 4 | 13
Net current period other comprehensive income (loss) |  | 5 | (5) | (18) | 7
Cumulative-effect of changes in accounting principle |  |  |  |  | (26)
Less other comprehensive income attributable to noncontrolling interest |  |  |  | (1) | 1
Ending balance |  | $ (186) | $ (118) | $ (186) | $ (118)
[1] | Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | See table below for details about these reclassifications.
[3] | Virginia Power’s reclassifications out of AOCI were immaterial for both the three and six months ended June 30, 2019 and 2018.

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