XML 68 R168.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Equity (Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 01, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI, including noncontrolling interest $ (1,793)   $ (1,699)
Less other comprehensive income (loss) attributable to noncontrolling interest 0   1
Total AOCI (1,793)   (1,700)
Deferred Gains and Losses on Derivatives-Hedging Activities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI (407)   (234)
Amount of tax   $ 135 79
Unrealized Gains and Losses on Investment Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI 37   2
Amount of tax (13)    
Unrecognized Pension and Other Postretirement Benefit Costs      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI (1,421)   (1,465)
Amount of tax 492   519
Other Comprehensive Loss From Equity Method Investee      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI (2)   (2)
Amount of tax 1    
Virginia Electric and Power Company      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI (29)   (12)
Virginia Electric and Power Company | Deferred Gains and Losses on Derivatives-Hedging Activities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI (34)   (13)
Amount of tax   $ 11 4
Virginia Electric and Power Company | Unrealized Gains and Losses on Investment Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI 5   1
Amount of tax (1)   0
Dominion Energy Gas Holdings, LLC      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI, including noncontrolling interest (188)   (169)
Less other comprehensive income (loss) attributable to noncontrolling interest (1)    
Total AOCI (187)   (169)
Dominion Energy Gas Holdings, LLC | Deferred Gains and Losses on Derivatives-Hedging Activities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI (82)   (25)
Amount of tax 28   8
Dominion Energy Gas Holdings, LLC | Unrecognized Pension and Other Postretirement Benefit Costs      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total AOCI (106)   (144)
Amount of tax $ 41   $ 56