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Employee Benefit Plans (Net Periodic Benefit Cost (Credit)) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | $ 40 | $ 40 | $ 80 | $ 79
Interest cost |  | 98 | 84 | 199 | 168
Expected return on plan assets |  | (176) | (168) | (353) | (333)
Amortization of prior service cost (credit) |  | 1 | 1 | 1 | 1
Amortization of net actuarial loss |  | 43 | 49 | 82 | 97
Settlements and curtailment | [1] | 71 | 0 | 73 | 0
Net periodic benefit cost (credit) |  | 77 | 6 | 82 | 12
Pension Benefits | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 4 | 5 | 8 | 9
Interest cost |  | 8 | 7 | 16 | 14
Expected return on plan assets |  | (39) | (38) | (78) | (75)
Amortization of prior service cost (credit) |  | 0 | 0 | 0 | 0
Amortization of net actuarial loss |  | 5 | 5 | 10 | 10
Settlements and curtailment | [2] | 1 | 0 | 1 | 0
Net periodic benefit cost (credit) |  | (21) | (21) | (43) | (42)
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 6 | 6 | 13 | 13
Interest cost |  | 17 | 14 | 34 | 28
Expected return on plan assets |  | (35) | (35) | (68) | (71)
Amortization of prior service cost (credit) |  | (13) | (13) | (26) | (26)
Amortization of net actuarial loss |  | 3 | 2 | 7 | 5
Settlements and curtailment | [1] | 42 | 0 | 42 | 0
Net periodic benefit cost (credit) |  | 20 | (26) | 2 | (51)
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 1 | 1 | 2 | 2
Interest cost |  | 2 | 2 | 5 | 5
Expected return on plan assets |  | (7) | (6) | (14) | (14)
Amortization of prior service cost (credit) |  | (1) | (1) | (2) | (2)
Amortization of net actuarial loss |  | 1 | 1 | 2 | 2
Settlements and curtailment | [2] | 1 | 0 | 1 | 0
Net periodic benefit cost (credit) |  | $ (3) | $ (3) | $ (6) | $ (7)
[1] | Primarily related to a voluntary retirement program.
[2] | Related to a voluntary retirement program.

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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