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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue | [1] | $ (4,496) | $ (3,858)
Purchased gas |  | 427 | 730
Interest and related charges |  | 490 | 469
Other income (expense) |  | 399 | (388)
Income from operations before income tax expense |  | 258 | 563
Income tax expense (benefit) |  | (19) | 114
Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue | [2] | (1,930) | (1,965)
Interest and related charges | [2] | 126 | 135
Other income (expense) |  | 52 | (37)
Income from operations before income tax expense |  | 311 | (24)
Income tax expense (benefit) |  | (31) | 4
Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue | [3] | (556) | (566)
Purchased gas | [3] | 8 | 12
Interest and related charges | [3] | 58 | 87
Other income (expense) | [3] | (49) | (42)
Income tax expense (benefit) |  | 52 | 43
Income (loss) including noncontrolling interests, net of tax |  | (202) | (172)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income from operations before income tax expense |  | 29 | (41)
Income tax expense (benefit) |  | (7) | 10
Income (loss) including noncontrolling interests, net of tax |  | 22 | (31)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income from operations before income tax expense |  | 8 | 3
Income tax expense (benefit) |  | (2) |
Income (loss) including noncontrolling interests, net of tax |  | 6 | 3
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Commodity contracts |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue |  | (7) | (54)
Purchased gas |  | 3 | (3)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Commodity contracts | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue |  |  | (2)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Interest rate contracts |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Interest and related charges |  | 27 | 10
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Interest rate contracts | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Interest and related charges |  | 2 | (1)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Foreign currency |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income (expense) |  | 6 | 6
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Amounts Reclassified From AOCI | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income (expense) |  | 6 | 6
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Realized (gains) losses on sale of securities |  | (13) |
Income from operations before income tax expense |  | (13) |
Income tax expense (benefit) |  | 4 |
Income (loss) including noncontrolling interests, net of tax |  | (9) |
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Realized (gains) losses on sale of securities |  | 2 |
Income from operations before income tax expense |  | 2 |
Income tax expense (benefit) |  | (1) |
Income (loss) including noncontrolling interests, net of tax |  | 1 |
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income (expense) |  | (6) | (5)
Amortization of actuarial losses | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income (expense) |  | 30 | 27
Unrecognized pension and other postretirement benefit costs |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 24 | 22
Unrecognized pension and other postretirement benefit costs, income tax expense (benefit) |  | (5) | (14)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 19 | 8
Unrecognized pension and other postretirement benefit costs | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 2 | 2
Unrecognized pension and other postretirement benefit costs, income tax expense (benefit) |  | (1) | (1)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 1 | 1
Unrecognized pension and other postretirement benefit costs | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income (expense) |  | $ 2 | $ 2
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 19 for amounts attributable to affiliates.
[3] | See Note 19 for amounts attributable to related parties.

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