Asset Impairment Charges After Tax

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- Definition

Long-lived assets fair value disclosure.

+ References

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Fair Value Measurements (Narrative) (Detail) - USD ($)	3 Months Ended						9 Months Ended
Fair Value Measurements (Narrative) (Detail) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)	$ (222,000,000)				$ 1,151,000,000		$ 194,000,000	$ 1,963,000,000
Unrealized gains or losses included in operating revenue in Level 3 fair value category	(6,000,000)				0		(8,000,000)	0
Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)	(230,000,000)				200,000,000		(269,000,000)	1,008,000,000
Unrealized gains or losses included in operating revenue in Level 3 fair value category	0				$ 0		0	$ 0
Corporate Office Building \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets, estimated fair value	26,000,000						$ 26,000,000
Nonregulated Retail Software Development \| Level 2 \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets, estimated fair value		$ 1,000,000
Impairment of Assets and Other Charges \| Virginia Electric and Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)			$ 76,000,000	$ 127,000,000		$ 754,000,000
Asset impairment charges after tax			$ 56,000,000			$ 561,000,000
Impairment of Assets and Other Charges \| Corporate Office Building
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)	16,000,000
Asset impairment charges after tax	$ 12,000,000
Impairment of Assets and Other Charges \| Nonregulated Retail Software Development
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of assets and other charges (benefits)		20,000,000
Asset impairment charges after tax		$ 15,000,000