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Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets $ 732 $ 890
Derivative Liabilities 1,324 1,102
Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 70  
Derivative Liabilities 23  
Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 4,872 [1] 4,791 [1]
Total liabilities 1,324 1,102
Fair Value, Measurements, Recurring | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 682 753
Derivative Liabilities 1,224 1,102
Fair Value, Measurements, Recurring | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 50 137
Derivative Liabilities 100  
Fair Value, Measurements, Recurring | Equity securities: | Large cap | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 2,570 [1] 2,417 [1]
Fair Value, Measurements, Recurring | Equity securities: | Large cap | Non-U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 12 [1] 13 [1]
Fair Value, Measurements, Recurring | Equity securities: | Other | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 6 [1] 79 [1]
Fair Value, Measurements, Recurring | Fixed income: | Corporate debt instruments
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 419 [1] 345 [1]
Fair Value, Measurements, Recurring | Fixed income: | U.S. Treasury securities and agency debentures
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 625 [1] 590 [1]
Fair Value, Measurements, Recurring | Fixed income: | State and municipal
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 366 [1] 343 [1]
Fair Value, Measurements, Recurring | Fixed income: | Other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 6 [1] 3 [1]
Fair Value, Measurements, Recurring | Cash equivalents and other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 136 [1] 103 [1]
Fair Value, Measurements, Recurring | Restricted cash equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   8 [1]
Fair Value, Measurements, Recurring | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 3,033 [1] 2,927 [1]
Total liabilities 1 3
Fair Value, Measurements, Recurring | Level 1 | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 0 3
Derivative Liabilities 1 3
Fair Value, Measurements, Recurring | Level 1 | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0  
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | Large cap | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 2,570 [1] 2,417 [1]
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | Large cap | Non-U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 12 [1] 13 [1]
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | Other | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 6 [1] 79 [1]
Fair Value, Measurements, Recurring | Level 1 | Fixed income: | Corporate debt instruments
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 1 | Fixed income: | U.S. Treasury securities and agency debentures
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 444 [1] 415 [1]
Fair Value, Measurements, Recurring | Level 1 | Fixed income: | State and municipal
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 1 | Fixed income: | Other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 1 | Restricted cash equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   0 [1]
Fair Value, Measurements, Recurring | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 1,769 [1] 1,832 [1]
Total liabilities 1,300 1,051
Fair Value, Measurements, Recurring | Level 2 | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 612 718
Derivative Liabilities 1,200 1,051
Fair Value, Measurements, Recurring | Level 2 | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 50 137
Derivative Liabilities 100  
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | Large cap | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | Large cap | Non-U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 2 | Equity securities: | Other | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 2 | Fixed income: | Corporate debt instruments
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 419 [1] 345 [1]
Fair Value, Measurements, Recurring | Level 2 | Fixed income: | U.S. Treasury securities and agency debentures
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 181 [1] 175 [1]
Fair Value, Measurements, Recurring | Level 2 | Fixed income: | State and municipal
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 366 [1] 343 [1]
Fair Value, Measurements, Recurring | Level 2 | Fixed income: | Other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 6 [1] 3 [1]
Fair Value, Measurements, Recurring | Level 2 | Cash equivalents and other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 135 [1] 103 [1]
Fair Value, Measurements, Recurring | Level 2 | Restricted cash equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   8 [1]
Fair Value, Measurements, Recurring | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 70 [1] 32 [1]
Total liabilities 23 48
Fair Value, Measurements, Recurring | Level 3 | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 70 32
Derivative Liabilities 23 48
Fair Value, Measurements, Recurring | Level 3 | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0  
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | Large cap | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | Large cap | Non-U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 3 | Equity securities: | Other | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 3 | Fixed income: | Corporate debt instruments
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 3 | Fixed income: | U.S. Treasury securities and agency debentures
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 3 | Fixed income: | State and municipal
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 3 | Fixed income: | Other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 3 | Cash equivalents and other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 3 | Restricted cash equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   0 [1]
Virginia Electric and Power Company
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 53 53
Derivative Liabilities 30 12
Virginia Electric and Power Company | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 50  
Derivative Liabilities 4  
Virginia Electric and Power Company | Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 1,838 [1] 1,716 [1]
Total liabilities 30 12
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 53 5
Derivative Liabilities 7 12
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets   48
Derivative Liabilities 23  
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Equity securities: | Large cap | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,101 [1] 1,021 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Equity securities: | Other | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   36 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Fixed income: | Corporate debt instruments
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 229 [1] 191 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Fixed income: | U.S. Treasury securities and agency debentures
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 227 [1] 212 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Fixed income: | State and municipal
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 185 [1] 164 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Cash equivalents and other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 43 [1] 31 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Restricted cash equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   8 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 1,267 [1] 1,203 [1]
Total liabilities 0 0
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1 | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0 0
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1 | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets   0
Derivative Liabilities 0  
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1 | Equity securities: | Large cap | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,101 [1] 1,021 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1 | Equity securities: | Other | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   36 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1 | Fixed income: | Corporate debt instruments
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1 | Fixed income: | U.S. Treasury securities and agency debentures
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 166 [1] 146 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1 | Fixed income: | State and municipal
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 1 | Restricted cash equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 521 [1] 511 [1]
Total liabilities 26 3
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2 | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 3 3
Derivative Liabilities 3 3
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2 | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets   48
Derivative Liabilities 23  
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2 | Equity securities: | Large cap | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2 | Equity securities: | Other | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2 | Fixed income: | Corporate debt instruments
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 229 [1] 191 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2 | Fixed income: | U.S. Treasury securities and agency debentures
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 61 [1] 66 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2 | Fixed income: | State and municipal
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 185 [1] 164 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2 | Cash equivalents and other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 43 [1] 31 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 2 | Restricted cash equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   8 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 50 [1] 2 [1]
Total liabilities 4 9
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3 | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 50 2
Derivative Liabilities 4 9
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3 | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets   0
Derivative Liabilities 0  
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3 | Equity securities: | Large cap | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3 | Equity securities: | Other | U.S.:
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3 | Fixed income: | Corporate debt instruments
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3 | Fixed income: | U.S. Treasury securities and agency debentures
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3 | Fixed income: | State and municipal
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3 | Cash equivalents and other
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 [1] 0 [1]
Virginia Electric and Power Company | Fair Value, Measurements, Recurring | Level 3 | Restricted cash equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   0 [1]
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets   0
Total liabilities 0  
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0 0
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets   0
Derivative Liabilities 0  
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets   0
Total liabilities 0  
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Level 1 | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0 0
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Level 1 | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets   0
Derivative Liabilities 0  
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets   0
Total liabilities 0  
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Level 2 | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0 0
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Level 2 | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets   0
Derivative Liabilities 0  
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets   0
Total liabilities 0  
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Level 3 | Commodity
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets 0 0
Derivative Liabilities 0 0
Dominion Gas Holdings, LLC | Fair Value, Measurements, Recurring | Level 3 | Interest rate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets   0
Derivative Liabilities $ 0  
[1] Includes investments held in the nuclear decommissioning and rabbi trusts.