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Operating Revenue (Schedule of Aggregate Amount of Transaction Price Allocated To Fixed-price Performance Obligations That Unsatisfied At End of Reporting Period And Expected To be Recognized) (Detail) $ in Millions | Dec. 31, 2020 USD ($)
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Revenues From Contract With Customer [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts | $ 770 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01 |  |
Revenues From Contract With Customer [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts | $ 67 | [1]
Revenue, expected to be recognized on multi-year contracts, period | 1 year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01 |  |
Revenues From Contract With Customer [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts | $ 66 | [1]
Revenue, expected to be recognized on multi-year contracts, period | 1 year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01 |  |
Revenues From Contract With Customer [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts | $ 64 | [1]
Revenue, expected to be recognized on multi-year contracts, period | 1 year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01 |  |
Revenues From Contract With Customer [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts | $ 57 | [1]
Revenue, expected to be recognized on multi-year contracts, period | 1 year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01 |  |
Revenues From Contract With Customer [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts | $ 50 | [1]
Revenue, expected to be recognized on multi-year contracts, period | 1 year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01 |  |
Revenues From Contract With Customer [Line Items] |  |
Revenue, expected to be recognized on multi-year contracts | $ 466 | [1]
Revenue, expected to be recognized on multi-year contracts, period |  |
[1] | Includes $1 million for Virginia Power in 2021.

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
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