XML 154 R102.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Fair Value Measurements (Assets and Liabilities that are Measured at Fair Value on a Recurring Basis) (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 01, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset $ 93   $ 294
Derivative Liabilities 740   279
Virginia Electric and Power Company      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 24   93
Derivative Liabilities 466   103
Virginia Electric and Power Company | Cash equivalents and other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 1    
Dominion Energy Gas Holdings, LLC      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 8   31
Derivative Liabilities 86   19
Total assets 8   31
Total liabilities 86   19
Dominion Energy Gas Holdings, LLC | Commodity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset     3
Dominion Energy Gas Holdings, LLC | Interest rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liabilities 83   17
Dominion Energy Gas Holdings, LLC | Foreign currency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liabilities 3    
Level 1 | Fixed Income | Government Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     455
Level 2 | Fixed Income | Corporate debt instruments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     431
Level 2 | Fixed Income | Government Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 719    
Level 2 | Virginia Electric and Power Company      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 623    
Level 2 | Dominion Energy Gas Holdings, LLC      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 8   31
Total liabilities 86   19
Level 3 | Virginia Electric and Power Company      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 19    
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 5,963   5,156
Total liabilities 740   279
Fair Value, Measurements, Recurring | Corporate debt instruments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     431
Fair Value, Measurements, Recurring | Equity securities: | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 4,195   3,277
Fair Value, Measurements, Recurring | Fixed Income | Corporate debt instruments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 463    
Fair Value, Measurements, Recurring | Fixed Income | Government Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 1,192   1,143
Fair Value, Measurements, Recurring | Cash equivalents and other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 20   11
Fair Value, Measurements, Recurring | Commodity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 74   250
Derivative Liabilities 131   135
Fair Value, Measurements, Recurring | Interest rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 11   18
Derivative Liabilities 606   142
Fair Value, Measurements, Recurring | Foreign currency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 8   26
Derivative Liabilities 3   2
Fair Value, Measurements, Recurring | Virginia Electric and Power Company      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 2,748   2,297
Total liabilities   $ 466 103
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Equity securities: | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     1,476
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Fixed Income | Corporate debt instruments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0    
Investments 1,920   221
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Fixed Income | Government Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 256   507
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Cash equivalents and other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 547    
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Commodity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 22   90
Derivative Liabilities 103   15
Fair Value, Measurements, Recurring | Virginia Electric and Power Company | Interest rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 2   3
Derivative Liabilities 363   88
Fair Value, Measurements, Recurring | Dominion Energy Gas Holdings, LLC | Interest rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset     2
Fair Value, Measurements, Recurring | Dominion Energy Gas Holdings, LLC | Foreign currency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset     26
Derivative Liabilities     2
Fair Value, Measurements, Recurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 4,687   3,743
Fair Value, Measurements, Recurring | Level 1 | Equity securities: | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 4,195   3,277
Fair Value, Measurements, Recurring | Level 1 | Fixed Income | Government Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 473    
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents and other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 19   11
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 2,106   1,640
Total liabilities 0    
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Equity securities: | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     1,476
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Fixed Income | Corporate debt instruments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 1,920    
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Fixed Income | Government Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     164
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Cash equivalents and other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 186    
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Commodity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0    
Derivative Liabilities 0    
Fair Value, Measurements, Recurring | Level 1 | Virginia Electric and Power Company | Interest rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0    
Derivative Liabilities 0    
Fair Value, Measurements, Recurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 1,257   1,343
Total liabilities 684   273
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 463    
Fair Value, Measurements, Recurring | Level 2 | Fixed Income | Government Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     688
Fair Value, Measurements, Recurring | Level 2 | Cash equivalents and other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 1    
Fair Value, Measurements, Recurring | Level 2 | Commodity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 55   180
Derivative Liabilities 75   129
Fair Value, Measurements, Recurring | Level 2 | Interest rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 11   18
Derivative Liabilities 606   142
Fair Value, Measurements, Recurring | Level 2 | Foreign currency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 8   26
Derivative Liabilities 3   2
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets     591
Total liabilities 410   97
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Equity securities: | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0    
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Fixed Income | Corporate debt instruments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     221
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Fixed Income | Government Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 256   343
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Cash equivalents and other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments 361    
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Commodity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 3   24
Derivative Liabilities 47   9
Fair Value, Measurements, Recurring | Level 2 | Virginia Electric and Power Company | Interest rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 2   3
Derivative Liabilities 363   88
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC | Commodity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset     3
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC | Interest rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset     2
Derivative Liabilities 83   17
Fair Value, Measurements, Recurring | Level 2 | Dominion Energy Gas Holdings, LLC | Foreign currency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 8   26
Derivative Liabilities 3   2
Fair Value, Measurements, Recurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 19   70
Total liabilities 56   6
Fair Value, Measurements, Recurring | Level 3 | Commodity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 19   70
Derivative Liabilities 56   6
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liabilities 0    
Total assets 19   66
Total liabilities 56   6
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Equity securities: | U.S.      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0    
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Fixed Income | Government Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 0    
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Commodity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset 19   66
Derivative Liabilities 56   $ 6
Fair Value, Measurements, Recurring | Level 3 | Virginia Electric and Power Company | Interest rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset $ 0