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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, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue | [1] | $ (3,466) | $ (3,384)
Purchased gas |  | 340 | 305
Electric fuel and other energy-related purchases |  | 744 | 575
Interest and related charges |  | 314 | 292
Other income |  | (100) | (162)
Income from operations including noncontrolling interests before income tax expense |  | (661) | (949)
Income tax expense |  | 135 | 275
Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue | [2] | (1,748) | (1,831)
Electric fuel and other energy-related purchases | [2] | 591 | 456
Interest and related charges | [2] | 132 | 120
Other income |  | (3) | (31)
Income from operations including noncontrolling interests before income tax expense |  | (235) | (564)
Income tax expense |  | 51 | 208
Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue | [3] | (526) | (490)
Purchased gas | [3] | 29 | 43
Interest and related charges | [3] | 25 | 23
Other income |  | (33) | (25)
Income from operations including noncontrolling interests before income tax expense |  | (218) | (165)
Income tax expense |  | 52 | 57
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income from operations including noncontrolling interests before income tax expense |  | 11 | (37)
Income tax expense |  | (3) | 14
Income from continuing operations including noncontrolling interests |  | 8 | (23)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Income from operations including noncontrolling interests before income tax expense |  | (4) | 18
Income tax expense |  | 1 | (7)
Income from continuing operations including noncontrolling interests |  | (3) | 11
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue |  | 12 | (62)
Purchased gas |  | 2 | (1)
Electric fuel and other energy-related purchases |  | (7) | 1
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating revenue |  | 3 | 3
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Interest and related charges |  | 12 | 11
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Interest and related charges |  | 1 | 1
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | (8) | 14
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | (8) | 14
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Realized (gain) loss on sale of securities |  | 1 | (53)
Impairment |  |  | 9
Income from operations including noncontrolling interests before income tax expense |  | 1 | (44)
Income tax expense |  |  | 16
Income from continuing operations including noncontrolling interests |  | 1 | (28)
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Realized (gain) loss on sale of securities |  |  | (6)
Impairment |  |  | 1
Income from operations including noncontrolling interests before income tax expense |  |  | (5)
Income tax expense |  |  | 2
Income from continuing operations including noncontrolling interests |  |  | (3)
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | (5) | (4)
Unrecognized pension and other postretirement benefit costs: |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 26 | 21
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (1) | (8)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 25 | 13
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 | 1
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (1) | (1)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 1 |
Amortization of actuarial losses | Amounts Reclassified From AOCI |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | 31 | 25
Amortization of actuarial losses | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income |  | $ 2 | $ 1
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 18 for amounts attributable to affiliates.
[3] | See Note 18 for amounts attributable to related parties.

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- Definition Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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