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Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Sep. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Junior subordinated notes $ 1,373 [1] $ 1,373
Subsidiary preferred stock 257 [1] 134
Valuation of certain fair value hedges 55 34
Issuance expenses of subsidiary preferred stock 2  
Carrying Amount
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Long-term Debt 18,396 [2] 18,801 [2]
Junior subordinated notes 1,373 [3] 1,373 [3]
Remarketable subordinated notes 1,080 [3] 2,083 [3]
Subsidiary preferred stock 257 [4] 134 [4]
Estimate of Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Long-term Debt 19,887 [2],[5] 20,853 [2],[5]
Junior subordinated notes 1,394 [3],[5] 1,379 [3],[5]
Remarketable subordinated notes 1,192 [3],[5] 2,233 [3],[5]
Subsidiary preferred stock 261 [4],[5] 140 [4],[5]
Virginia Electric and Power Company
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Subsidiary preferred stock 257 [6] 134
Virginia Electric and Power Company | Carrying Amount
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Long-term Debt 8,032 [3] 8,728 [3]
Subsidiary preferred stock 257 [4] 134 [4]
Virginia Electric and Power Company | Estimate of Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Long-term Debt 8,897 [3],[5] 9,858 [3],[5]
Subsidiary preferred stock 261 [4],[5] 140 [4],[5]
Dominion Gas Holdings, LLC | Carrying Amount
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Long-term Debt 1,198 [3] 1,199 [3]
Dominion Gas Holdings, LLC | Estimate of Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Long-term Debt $ 1,169 [3],[5] $ 1,237 [3],[5]
[1] Dominion’s Consolidated Balance Sheet at December 31, 2013 has been derived from the audited Consolidated Financial Statements at that date.
[2] Carrying amount includes amounts which represent the unamortized discount and/or premium. At September 30, 2014 and December 31, 2013, includes the valuation of certain fair value hedges associated with fixed rate debt of approximately $34 million and $55 million, respectively.
[3] Carrying amount includes amounts which represent the unamortized discount and/or premium.
[4] Carrying amount includes deferred issuance expenses of $2 million at December 31, 2013.
[5] Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issues with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.
[6] Virginia Power’s Consolidated Balance Sheet at December 31, 2013 has been derived from the audited Consolidated Financial Statements at that date.