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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance | [1] |  |  |  |  | $ 31,994 |  |  |
Total other comprehensive income (loss) |  | $ 38 |  | $ 48 |  | (187) |  | $ 17 |
Ending balance |  | 28,871 |  |  |  | 28,871 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 13,556 |  | 12,944 |  | 13,989 | [2] | 13,047 |
Total other comprehensive income (loss) |  | 5 |  | (9) |  | (41) |  | (14) |
Ending balance |  | 13,944 |  | 12,964 |  | 13,944 |  | 12,964 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) |  | 0 |  | 5 |  | (84) |  | (18) |
Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (651) |  | (290) |  | (407) |  | (235) |
Other comprehensive income before reclassifications: gains (losses) |  | 2 |  | (78) |  | (264) |  | (102) |
Amounts reclassified from AOCI: (gains) losses | [3] | 5 |  | (21) |  | 27 |  | (52) |
Total other comprehensive income (loss) |  | 7 |  | (99) |  | (237) |  | (154) |
Ending balance |  | (644) |  | (389) |  | (644) |  | (389) |
Deferred Gains and Losses on Derivatives-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (79) |  | (20) |  | (34) |  | (13) |
Other comprehensive income before reclassifications: gains (losses) |  | 1 |  | (11) |  | (44) |  | (18) |
Amounts reclassified from AOCI: (gains) losses | [4] | 0 |  | 1 |  | 0 |  | 1 |
Total other comprehensive income (loss) |  | 1 |  | (10) |  | (44) |  | (17) |
Ending balance |  | (78) |  | (30) |  | (78) |  | (30) |
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (166) |  | (48) |  | (81) |  | (25) |
Other comprehensive income before reclassifications: gains (losses) |  |  |  | (24) |  | (91) |  | (51) |
Amounts reclassified from AOCI: (gains) losses |  | (2) | [3] | (2) | [3] | 4 | [5] | 1 | [5]
Total other comprehensive income (loss) |  | (2) |  | (26) |  | (87) |  | (50) |
Ending balance |  | (168) |  | (74) |  | (168) |  | (74) |
Less other comprehensive income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  | (1) |
Unrealized Gains and Losses on Investment Securities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 37 |  | 18 |  | 37 |  | 2 |
Other comprehensive income before reclassifications: gains (losses) |  | 19 |  | 13 |  | 28 |  | 29 |
Amounts reclassified from AOCI: (gains) losses | [3] | (5) |  | (1) |  | (14) |  | (1) |
Total other comprehensive income (loss) |  | 14 |  | 12 |  | 14 |  | 28 |
Ending balance |  | 51 |  | 30 |  | 51 |  | 30 |
Unrealized Gains and Losses on Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | 4 |  | 3 |  | 5 |  | 1 |
Other comprehensive income before reclassifications: gains (losses) |  | 6 |  | 2 |  | 4 |  | 4 |
Amounts reclassified from AOCI: (gains) losses | [4] | (2) |  | (1) |  | (1) |  | (1) |
Total other comprehensive income (loss) |  | 4 |  | 1 |  | 3 |  | 3 |
Ending balance |  | 8 |  | 4 |  | 8 |  | 4 |
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (1,402) |  | (1,457) |  | (1,421) |  | (1,465) |
Other comprehensive income before reclassifications: gains (losses) |  | (1) |  | 113 |  | (1) |  | 113 |
Amounts reclassified from AOCI: (gains) losses | [3] | 18 |  | 22 |  | 37 |  | 30 |
Total other comprehensive income (loss) |  | 17 |  | 135 |  | 36 |  | 143 |
Ending balance |  | (1,385) |  | (1,322) |  | (1,385) |  | (1,322) |
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (105) |  | (143) |  | (106) |  | (144) |
Other comprehensive income before reclassifications: gains (losses) |  |  |  | 29 |  | 0 |  | 29 |
Amounts reclassified from AOCI: (gains) losses |  | 2 | [3] | 2 | [3] | 3 | [5] | 3 | [5]
Total other comprehensive income (loss) |  | 2 |  | 31 |  | 3 |  | 32 |
Ending balance |  | (103) |  | (112) |  | (103) |  | (112) |
Less other comprehensive income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  | 0 |
Other Comprehensive Loss From Equity Method Investees |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (2) |  | (2) |  | (2) |  | (2) |
Other comprehensive income before reclassifications: gains (losses) |  | 0 |  | 0 |  | 0 |  | 0 |
Amounts reclassified from AOCI: (gains) losses | [3] | 0 |  | 0 |  | 0 |  | 0 |
Total other comprehensive income (loss) |  | 0 |  | 0 |  | 0 |  | 0 |
Ending balance |  | (2) |  | (2) |  | (2) |  | (2) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (2,018) |  | (1,731) |  | (1,793) |  | (1,700) |
Other comprehensive income before reclassifications: gains (losses) |  | 20 |  | 48 |  | (237) |  | 40 |
Amounts reclassified from AOCI: (gains) losses | [3] | 18 |  | 0 |  | 50 |  | (23) |
Total other comprehensive income (loss) |  | 38 |  | 48 |  | (187) |  | 17 |
Ending balance |  | (1,980) |  | (1,683) |  | (1,980) |  | (1,683) |
Accumulated Other Comprehensive Income (Loss) | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (75) |  | (17) |  | (29) |  | (12) |
Other comprehensive income before reclassifications: gains (losses) |  | 7 |  | (9) |  | (40) |  | (14) |
Amounts reclassified from AOCI: (gains) losses | [4] | (2) |  | 0 |  | (1) |  | 0 |
Total other comprehensive income (loss) |  | 5 |  | (9) |  | (41) |  | (14) |
Ending balance |  | (70) |  | (26) |  | (70) |  | (26) |
Accumulated Other Comprehensive Income (Loss) | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance |  | (271) |  | (191) |  | (187) |  | (169) |
Other comprehensive income before reclassifications: gains (losses) |  |  |  | 5 |  | (91) |  | (22) |
Amounts reclassified from AOCI: (gains) losses |  | 0 | [3] | 0 | [3] | 7 | [5] | 4 | [5]
Total other comprehensive income (loss) |  | 0 |  | 5 |  | (84) |  | (18) |
Ending balance |  | $ (271) |  | $ (186) |  | $ (271) |  | (186) |
Less other comprehensive income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  | $ (1) |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | See table below for details about these reclassifications.
[4] | See table below for details about these reclassifications. Virginia Power’s reclassifications out of AOCI were immaterial for both the three and six months ended June 30, 2019
[5] | See table below for details about these reclassifications

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