Long-Term Debt (Based on Stated Maturity Dates Rather than Early Redemption Dates that Could be Elected by Instrument Holders) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Debt Instrument [Line Items]
2013	$ 2,200
2014	1,080
2015	978
2016	1,390
2017	1,400
Thereafter	11,940
Total	18,988
Virginia Electric and Power Company
Debt Instrument [Line Items]
2013	418
2014	17
2015	211
2016	476
2017	679
Thereafter	4,875
Total	6,676
2013
Debt Instrument [Line Items]
Weighted-average Coupon	4.53%
2013 \| Virginia Electric and Power Company
Debt Instrument [Line Items]
Weighted-average Coupon	4.88%
2014
Debt Instrument [Line Items]
Weighted-average Coupon	3.99%
2014 \| Virginia Electric and Power Company
Debt Instrument [Line Items]
Weighted-average Coupon	7.73%
2015
Debt Instrument [Line Items]
Weighted-average Coupon	4.50%
2015 \| Virginia Electric and Power Company
Debt Instrument [Line Items]
Weighted-average Coupon	5.39%
2016
Debt Instrument [Line Items]
Weighted-average Coupon	4.27%
2016 \| Virginia Electric and Power Company
Debt Instrument [Line Items]
Weighted-average Coupon	5.27%
2017
Debt Instrument [Line Items]
Weighted-average Coupon	4.60%
2017 \| Virginia Electric and Power Company
Debt Instrument [Line Items]
Weighted-average Coupon	5.44%
Thereafter
Debt Instrument [Line Items]
Weighted-average Coupon	5.54%
Thereafter \| Virginia Electric and Power Company
Debt Instrument [Line Items]
Weighted-average Coupon	5.26%
Secured Senior Notes
Debt Instrument [Line Items]
2013	852
2014	15
2015	18
2016	20
2017	22
Thereafter	60
Total	987
Unsecured Senior Notes
Debt Instrument [Line Items]
2013	1,090
2014	1,065
2015	960
2016	1,351
2017	1,303
Thereafter	9,278
Total	15,047
Tax-Exempt Financings
Debt Instrument [Line Items]
2013	0
2014	0
2015	0
2016	19
2017	75
Thereafter	1,227
Total	1,321
Unsecured Junior Subordinated Notes Payable to Affiliated Trusts
Debt Instrument [Line Items]
2013	258
2014	0
2015	0
2016	0
2017	0
Thereafter	10
Total	268
Enhanced Junior Subordinated Notes
Debt Instrument [Line Items]
2013	0
2014	0
2015	0
2016	0
2017	0
Thereafter	1,365
Total	$ 1,365

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Article 9

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-Article 7

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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