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Investments (Selected Information Regarding Marketable Equity and Debt Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 363 | $ 341 | $ 1,119 | $ 709
Realized gains | [1] | 23 | 37 | 117 | 62
Realized losses | [1] | 16 | 15 | 36 | 34
Virginia Electric and Power Company |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 168 | 154 | 498 | 347
Realized gains | [1] | 10 | 18 | 55 | 30
Realized losses | [1] | $ 8 | $ 7 | $ 18 | $ 17
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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- Definition The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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