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Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Significant noncash investing and financing activities: |  |  |
Accrued capital expenditures |  | $ 425 | $ 341
Leases | [1] | 24 | 9
Virginia Electric and Power Company |  |  |
Significant noncash investing and financing activities: |  |  |
Accrued capital expenditures |  | 252 | 262
Leases | [2] | $ 21 | $ 1
[1] | Includes $6 million and $2 million of financing leases at March 31, 2022 and 2021, respectively, and $18 million and $7 million of operating leases at March 31, 2022 and 2021, respectively.
[2] | Includes $4 million and $1 million of financing leases at March 31, 2022 and 2021, respectively, and $17 million of operating leases at March 31, 2022

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