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Investments (Portion of Unrealized Gains and Losses Relates to Equity Securities) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investment Holdings [Line Items]
Net gains (losses) recognized during the period		$ 610	$ 156	$ (288)	$ 570
Less: Net (gains) losses recognized during the period on securities sold during the period		(5)	(25)	9	(44)
Unrealized gains (losses) recognized during the period on securities still held at June 30, 2020 and 2019	[1]	605	131	(279)	526
Virginia Electric and Power Company
Investment Holdings [Line Items]
Net gains (losses) recognized during the period		269	70	(154)	256
Less: Net (gains) losses recognized during the period on securities sold during the period		(3)	(7)	3	(8)
Unrealized gains (losses) recognized during the period on securities still held at June 30, 2020 and 2019	[1]	$ 266	$ 63	$ (151)	$ 248
[1] Included in other income and the nuclear decommissioning trust regulatory liability.

X

- Definition

Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714

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- Definition

Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714

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- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714

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