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Asset Retirement Obligations (Changes to AROs) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Asset Retirement Obligations [Line Items]    
AROs, Beginning balance $ 5,583 [1] $ 5,184
Obligations incurred during the period 31 67
Obligations settled during the period (165) (114)
Revisions in estimated cash flows (151) [2] 228 [3]
Accretion 224 218
Sale of non-wholly-owned nonregulated solar facilities (49)  
AROs, Ending balance [1] 5,473 5,583
Virginia Electric and Power Company    
Asset Retirement Obligations [Line Items]    
AROs, Beginning balance 3,820 3,581
Obligations incurred during the period 26 48
Obligations settled during the period (131) (85)
Revisions in estimated cash flows 67 [4] 139 [5]
Accretion 141 137
AROs, Ending balance $ 3,923 $ 3,820
[1] Includes $179 million and $198 million reported in other current liabilities at December 31, 2020 and 2021, respectively
[2] Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities, estimated cash flow projections associated with the recovery of spent nuclear fuel costs for its AROs associated with the decommissioning of Kewaunee and estimated cash flow projections associated with certain gas distribution pipelines.  These revisions in 2021 resulted in a charge of $44 million ($35 million after-tax) within other operations and maintenance expense in the Consolidated Statements of Income as well as a $173 million decrease to property, plant and equipment, net.
[3] Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities, asbestos abatement costs associated with certain utility facilities and from the completion of a nuclear decommissioning cost study related to Summer.
[4] Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities.
[5] Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities and asbestos abatement costs associated with certain utility facilities.