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Income Taxes (Narrative) (Detail) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2020
Aug. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Line Items]              
Percentage of interest expense adjusted to taxable income       30.00%      
State deferred income tax expense (benefit)       $ 32,000,000 $ (19,000,000) $ 72,000,000  
Income tax expense $ 336,000,000   $ 173,000,000 68,000,000 425,000,000 83,000,000  
Income tax expense (benefit) from discontinued operations       8,000,000 188,000,000 (204,000,000)  
Deferred income tax expense (benefit)       1,000,000 425,000,000 439,000,000  
Income tax benefit associated with remeasurement of state deferred taxes       (36,000,000) (43,000,000) (44,000,000)  
Income tax expense attributable to noncontrolling interest           55,000,000  
Unrecognized tax benefits     128,000,000 117,000,000 128,000,000 167,000,000 $ 175,000,000
Unrecognized tax benefits that would impact effective tax rate     72,000,000 64,000,000 72,000,000 140,000,000  
Maximum              
Income Taxes [Line Items]              
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations       39,000,000      
Amount that earnings could potentially increase if changes were to occur       26,000,000      
Virginia Electric and Power Company              
Income Taxes [Line Items]              
State deferred income tax expense (benefit)       112,000,000 118,000,000 7,000,000  
Income tax expense       191,000,000 397,000,000 229,000,000  
Deferred income tax expense (benefit)       176,000,000 224,000,000 (246,000,000)  
Income tax benefit associated with remeasurement of state deferred taxes       0 0 0  
Unrecognized tax benefits     0 0 0 0  
Hope Gas Inc [Member]              
Income Taxes [Line Items]              
Income tax expense       $ 34,000,000      
Percentage of equity interests sold       100.00%      
Discontinued Operations              
Income Taxes [Line Items]              
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits           5,000,000  
Unrecognized tax benefits that would impact effective tax rate     $ 33,000,000 $ 33,000,000 33,000,000    
Continuing Operations              
Income Taxes [Line Items]              
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits       $ (7,000,000) (34,000,000) (6,000,000)  
Deferred income tax expense (benefit)         (21,000,000)    
Continuing Operations | Virginia Electric and Power Company              
Income Taxes [Line Items]              
Deferred income tax expense (benefit)         (16,000,000)    
Continuing Operations | SCANA              
Income Taxes [Line Items]              
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits         (38,000,000)    
Atlantic Coast Pipeline | Discontinued Operations | Supply Header Project              
Income Taxes [Line Items]              
Income tax charge           81,000,000  
State              
Income Taxes [Line Items]              
Income tax benefit associated with remeasurement of state deferred taxes           45,000,000  
IRA              
Income Taxes [Line Items]              
Percentage of alternate minimum tax on GAAP net income   15.00%          
IRA | Minimum              
Income Taxes [Line Items]              
Tax credit expiration year   2032          
Annual financial statement income for tax years   $ 1,000,000,000          
GT&S Transaction              
Income Taxes [Line Items]              
State deferred income tax expense (benefit)           18,000,000  
Income tax expense (benefit) from discontinued operations         (17,000,000)    
GT&S Transaction | Discontinued Operations              
Income Taxes [Line Items]              
Income tax benefit related to finalizing income tax returns         (14,000,000)    
Income tax expense (benefit) on non-deductible goodwill written off           $ 236,000,000  
Q-Pipe Group | Discontinued Operations              
Income Taxes [Line Items]              
Income tax expense (benefit) on non-deductible goodwill written off         $ 36,000,000