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Summary of Significant Accounting Policies and Other Matters (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of Total Excise Taxes Recorded in Operating Revenues | Total excise taxes (inclusive of gross receipts taxes) recorded in operating revenues were as follows:
| For the Years Ended December 31,
(Millions of Dollars) | 2023 |  | 2022 |  | 2021
Con Edison | $409 |  | $400 |  | $358
CECONY | 396 |  | 387 |  | 346
Capitalized Cost of Utility Plant | At December 31, 2023 and 2022, the capitalized cost of the Companies’ utility plant, net of accumulated depreciation, was as follows:
| Con Edison |  | CECONY
(Millions of Dollars) | 2023 |  | 2022 |  | 2023 |  | 2022
Electric |  |  |  |  |  |  |
Generation | $580 |  | $534 |  | $580 |  | $534
Transmission | 4,652 |  | 4,223 |  | 4,333 |  | 3,916
Distribution | 24,491 |  | 23,345 |  | 23,238 |  | 22,130
General | 141 |  | 113 |  | 141 |  | 113 |
Gas (a) | 12,023 |  | 11,326 |  | 11,226 |  | 10,567
Steam | 1,990 |  | 1,962 |  | 1,990 |  | 1,962
General | 3,158 |  | 2,648 |  | 2,860 |  | 2,410
Held for future use | 118 |  | 117 |  | 110 |  | 109
Construction work in progress | 2,442 |  | 2,484 |  | 2,168 |  | 2,268
Net Utility Plant | $49,594 |  | $46,752 |  | $46,646 |  | $44,009
(a) Primarily distribution.
Schedule of Other Deferred Charges and Noncurrent Assets and Prepayments | Other deferred charges and noncurrent assets and prepayments, net of accumulated depreciation, included the following related to implementation costs incurred in cloud computing arrangements:
| Con Edison | CECONY |
(Millions of Dollars) | 2023 | 2022 | 2023 | 2022 |
Prepayments (a)(b) | $50 | $24 | $49 | $23 |
Other Deferred Charges and Noncurrent Assets (a)(b) | 179 | 105 | 178 | 103 |
(a) Amortization on these assets is computed using the straight-line method for financial statement purposes over their estimated useful lives. (b) Amortization expense related to these assets incurred during the year ended December 31, 2023 for Con Edison and CECONY was $21 million and $20 million, respectively, for the year ended December 31, 2022 for Con Edison and CECONY was $15 million and $14 million, respectively, and for the year ended December 31, 2021 for Con Edison and CECONY was $12 million and $11 million, respectively. Accumulated amortization related to these assets for Con Edison and CECONY was $58 million and $53 million, respectively at December 31, 2023 and was $37 million and $33 million, respectively at December 31, 2022.
Schedule of Investment Assets | The following investment assets are included in the Companies' consolidated balance sheets at December 31, 2023 and 2022:
| Con Edison |  | CECONY
(Millions of Dollars) | 2023 |  | 2022 |  | 2023 |  | 2022
Con Edison Transmission investment in MVP (a) | $144 |  | $111 |  | $— |  | $—
Supplemental retirement income plan assets (b) | 524 |  | 459 |  | 502 |  | 439
Deferred income plan assets | 99 |  | 93 |  | 99 |  | 93
Con Edison Transmission's investment in New York Transco (c) | 221 |  | 176 |  | — |  |  | — |
Virginia Tax Equity Projects (d) | 8 |  | — |  |  | — |  |  | — |
Other | 3 |  | 2 |  | 7 |  | 7
Total investments | $999 |  | $841 |  | $608 |  | $539
(a)At December 31, 2023 and 2022, Con Edison Transmission's cash investment in MVP was $530 million. In January 2024, the operator of the Mountain Valley Pipeline indicated that it is targeting an in-service date for the project in the first quarter of 2024 at an overall project cost of approximately $7,200 million excluding allowance for funds used during construction. See "Investment in Mountain Valley Pipeline, LLC (MVP)" above. (b)See Note E. (c)Con Edison Transmission owns a 45.7 percent interest in New York Transco's TOTS and NYES projects and a 41.7 percent interest in New York Transco's share of the Propel NY Energy project. (d)See Note S.
Basic and Diluted EPS | Basic and diluted EPS for Con Edison are calculated as follows:
| For the Years Ended December 31,
(Millions of Dollars, except per share amounts/Shares in Millions) | 2023 |  | 2022 |  | 2021
Net income for common stock | $2,519 |  | $1,660 |  | $1,346
Weighted average common shares outstanding – basic | 347.7 |  | 354.5 |  | 348.4
Add: Incremental shares attributable to effect of potentially dilutive securities | 1.6 |  | 1.3 |  | 1.0
Adjusted weighted average common shares outstanding – diluted | 349.3 |  | 355.8 |  | 349.4
Net Income per common share – basic | $7.25 |  | $4.68 |  | $3.86
Net Income per common share – diluted | $7.21 |  | $4.66 |  | $3.85
Changes in Accumulated Other Comprehensive Income/(Loss) | Changes to accumulated other comprehensive income/(loss) (OCI) for Con Edison and CECONY are as follows:
(Millions of Dollars) | Con Edison |  | CECONY
Accumulated OCI, net of taxes, at December 31, 2020 (a) | $(25) |  | $(7)
OCI before reclassifications, net of tax of $(8) and $2 for Con Edison and CECONY, respectively | 22 |  | 5
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(3) and $(1) for Con Edison and CECONY, respectively (a)(b) | 8 |  | 2
Total OCI, net of taxes, at December 31, 2021 | 30 |  | 7
Accumulated OCI, net of taxes, at December 31, 2021 (a) | $5 |  | $—
OCI before reclassifications, net of tax of $(5) and $(1) for Con Edison and CECONY, respectively | 13 |  | 3 |
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison (a)(b) | 4 |  | 1
Total OCI, net of taxes, at December 31, 2022 | 17 |  | 4
Accumulated OCI, net of taxes, at December 31, 2022 (a) | $22 |  | $4
OCI before reclassifications, net of tax | — |  | (2)
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax (a)(b) | — |  | —
Total OCI, net of taxes, at December 31, 2023 | — |  | (2)
Accumulated OCI, net of taxes, at December 31, 2023 (a) | $22 |  | $2
(a) Tax reclassified from accumulated OCI is reported in the income tax expense line item of the consolidated income statement. (b) For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets and liabilities instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of total periodic pension and other postretirement benefit cost. See Notes E and F.
Restrictions on Cash and Cash Equivalents | At December 31, 2023 and 2022, cash, temporary cash investments and restricted cash for Con Edison were as follows; CECONY did not have material restricted cash balances as of December 31, 2023 and 2022:
| At December 31,
| Con Edison
(Millions of Dollars) | 2023 | 2022
Cash and temporary cash investments | $1,189 | $1,282
Restricted cash (a) | 6 | 223
Total cash, temporary cash investments and restricted cash | $1,195 | $1,505
(a)Con Edison restricted cash included cash of the Clean Energy Businesses' renewable electric project subsidiaries ($6 million and $223 million at December 31, 2023 and 2022, respectively) that, under the related project debt agreements, was restricted to being used for normal operating expenditures, debt service, and required reserves until the various maturity dates of the project debt. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W. Con Edison retained one deferred project, Broken Bow II, a 75 MW nameplate capacity wind power project located in Nebraska. Con Edison's restricted cash for the 2023 period includes restricted cash of Broken Bow II that continued to be classified as held for sale as of December 31, 2023. See Note X.
Schedule of Cash and Cash Equivalents | At December 31, 2023 and 2022, cash, temporary cash investments and restricted cash for Con Edison were as follows; CECONY did not have material restricted cash balances as of December 31, 2023 and 2022:
| At December 31,
| Con Edison
(Millions of Dollars) | 2023 | 2022
Cash and temporary cash investments | $1,189 | $1,282
Restricted cash (a) | 6 | 223
Total cash, temporary cash investments and restricted cash | $1,195 | $1,505
(a)Con Edison restricted cash included cash of the Clean Energy Businesses' renewable electric project subsidiaries ($6 million and $223 million at December 31, 2023 and 2022, respectively) that, under the related project debt agreements, was restricted to being used for normal operating expenditures, debt service, and required reserves until the various maturity dates of the project debt. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W. Con Edison retained one deferred project, Broken Bow II, a 75 MW nameplate capacity wind power project located in Nebraska. Con Edison's restricted cash for the 2023 period includes restricted cash of Broken Bow II that continued to be classified as held for sale as of December 31, 2023. See Note X.

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