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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | $ 28,381 | $ 20,036 | $ 22,048 | [1] | $ 19,370
Beginning balance | [1] |  |  | 20,107 |  |
Ending balance |  | 29,957 | 20,426 | 29,957 |  | 20,426
Ending balance |  | 29,286 |  | 29,286 |  |
Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | 12,964 | 12,497 | 13,047 | [2] | 12,224
Ending balance |  | 13,550 | 12,917 | 13,550 |  | 12,917
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | [3] |  |  | 8,865 |  |
Ending balance |  | 8,741 |  | 8,741 |  |
Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (389) | (248) | (235) |  | (302)
Other comprehensive income before reclassifications: gains (losses) |  | (107) | (27) | (209) |  | 51
Amounts reclassified from AOCI: (gains) losses | [4] | (6) | 30 | (58) |  | 71
Net current period other comprehensive income (loss) |  | (113) | 3 | (267) |  | 122
Ending balance |  | (502) | (245) | (502) |  | (245)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (64)
Less other comprehensive income attributable to noncontrolling interest |  |  |  |  |  | 1
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (30) | (8) | (13) |  | (12)
Other comprehensive income before reclassifications: gains (losses) |  | (16) | 3 | (34) |  | 10
Amounts reclassified from AOCI: (gains) losses | [5] |  |  | 1 |  |
Net current period other comprehensive income (loss) |  | (16) | 3 | (33) |  | 10
Ending balance |  | (46) | (5) | (46) |  | (5)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (3)
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (74) | (24) | (25) |  | (23)
Other comprehensive income before reclassifications: gains (losses) |  | (36) | 4 | (87) |  | (2)
Amounts reclassified from AOCI: (gains) losses | [4] | 9 | 4 | 10 |  | 15
Net current period other comprehensive income (loss) |  | (27) | 8 | (77) |  | 13
Ending balance |  | (101) | (16) | (101) |  | (16)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (5)
Less other comprehensive income attributable to noncontrolling interest |  |  |  | (1) |  | 1
Unrealized Gains and Losses on Investment Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | 30 | (2) | 2 |  | 747
Other comprehensive income before reclassifications: gains (losses) |  | 8 | (6) | 37 |  | (24)
Amounts reclassified from AOCI: (gains) losses | [4] | (4) | 3 | (5) |  | 4
Net current period other comprehensive income (loss) |  | 4 | (3) | 32 |  | (20)
Ending balance |  | 34 | (5) | 34 |  | (5)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (732)
Unrealized Gains and Losses on Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | 4 | (1) | 1 |  | 74
Other comprehensive income before reclassifications: gains (losses) |  | 1 |  | 5 |  | (2)
Amounts reclassified from AOCI: (gains) losses | [5] |  |  | (1) |  |
Net current period other comprehensive income (loss) |  | 1 |  | 4 |  | (2)
Ending balance |  | 5 | (1) | 5 |  | (1)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (73)
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (1,322) | (1,286) | (1,465) |  | (1,101)
Other comprehensive income before reclassifications: gains (losses) |  | (4) |  | 109 |  |
Amounts reclassified from AOCI: (gains) losses | [4] | 20 | 18 | 50 |  | 60
Net current period other comprehensive income (loss) |  | 16 | 18 | 159 |  | 60
Ending balance |  | (1,306) | (1,268) | (1,306) |  | (1,268)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (227)
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (112) | (94) | (144) |  | (75)
Other comprehensive income before reclassifications: gains (losses) |  | (1) |  | 28 |  |
Amounts reclassified from AOCI: (gains) losses | [4] | 1 | 2 | 4 |  | 4
Net current period other comprehensive income (loss) |  |  | 2 | 32 |  | 4
Ending balance |  | (112) | (92) | (112) |  | (92)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (21)
Other Comprehensive Loss From Equity Method Investee |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (2) | (2) | (2) |  | (3)
Other comprehensive income before reclassifications: gains (losses) |  | (1) |  | (1) |  | 1
Net current period other comprehensive income (loss) |  | (1) |  | (1) |  | 1
Ending balance |  | (3) | (2) | (3) |  | (2)
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (1,683) | (1,538) | (1,700) |  | (659)
Other comprehensive income before reclassifications: gains (losses) |  | (104) | (33) | (64) |  | 28
Amounts reclassified from AOCI: (gains) losses | [4] | 10 | 51 | (13) |  | 135
Net current period other comprehensive income (loss) |  | (94) | 18 | (77) |  | 163
Ending balance |  | (1,777) | (1,520) | (1,777) |  | (1,520)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (1,023)
Less other comprehensive income attributable to noncontrolling interest |  |  |  |  |  | 1
Accumulated Other Comprehensive Income (Loss) | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (26) | (9) | (12) |  | 62
Other comprehensive income before reclassifications: gains (losses) |  | (15) | 3 | (29) |  | 8
Net current period other comprehensive income (loss) |  | (15) | 3 | (29) |  | 8
Ending balance |  | (41) | (6) | (41) |  | (6)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (76)
Accumulated Other Comprehensive Income (Loss) | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance |  | (186) | (118) | (169) |  | (98)
Other comprehensive income before reclassifications: gains (losses) |  | (37) | 4 | (59) |  | (2)
Amounts reclassified from AOCI: (gains) losses | [4] | 10 | 6 | 14 |  | 19
Net current period other comprehensive income (loss) |  | (27) | 10 | (45) |  | 17
Ending balance |  | $ (213) | $ (108) | (213) |  | (108)
Cumulative-effect of changes in accounting principle |  |  |  |  |  | (26)
Less other comprehensive income attributable to noncontrolling interest |  |  |  | $ (1) |  | $ 1
[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] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | See table below for details about these reclassifications.
[5] | Virginia Power’s reclassifications out of AOCI were immaterial for both the three and nine months ended September 30, 2019 and 2018.

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