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Summary of Significant Accounting Policies and Other Matters (Tables) | 12 Months Ended
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Dec. 31, 2021
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) | 2021 |  | 2020 |  | 2019
Con Edison | $358 |  | $335 |  | $323
CECONY | 346 |  | 323 |  | 312
Capitalized Cost of Utility Plant | At December 31, 2021 and 2020, the capitalized cost of the Companies’ utility plant, net of accumulated depreciation, was as follows:
| Con Edison |  | CECONY
(Millions of Dollars) | 2021 |  | 2020 |  | 2021 |  | 2020
Electric |  |  |  |  |  |  |
Generation | $559 |  | $572 |  | $559 |  | $572
Transmission | 3,955 |  | 3,786 |  | 3,658 |  | 3,496
Distribution | 22,418 |  | 21,481 |  | 21,240 |  | 20,366
General | 87 |  | 52 |  |  | 87 |  | 52 |
Gas (a) | 10,473 |  | 9,206 |  | 9,748 |  | 8,522
Steam | 1,924 |  | 1,854 |  | 1,924 |  | 1,854
General | 2,566 |  | 2,507 |  | 2,338 |  | 2,286
Held for future use | 80 |  | 92 |  | 72 |  | 84
Construction work in progress | 2,152 |  | 2,474 |  | 1,985 |  | 2,320
Net Utility Plant | $44,214 |  | $42,024 |  | $41,611 |  | $39,552
(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) | 2021 | 2020 | 2021 | 2020 |
Prepayments (a)(b) | $16 | $12 | $15 | $11 |
Other Deferred Charges and Noncurrent Assets (a)(b) | $81 | $54 | $78 | $51 |
(a) Depreciation on these assets is computed using the straight-line method for financial statement purposes over their estimated useful lives. (b) Depreciation expense related to these assets incurred during the year ended December 31, 2021 for Con Edison and CECONY was $12 million and $11 million, respectively, and for the year ended December 31, 2020 for Con Edison and CECONY was $7 million and $6 million, respectively. Accumulated depreciation related to these assets for Con Edison and CECONY was $22 million and $19 million, respectively at December 31, 2021 and was $10 million and $8 million, respectively at December 31, 2020.
Schedule of Investment Assets | The following investment assets are included in the Companies' consolidated balance sheets at December 31, 2021 and 2020:
| Con Edison |  | CECONY
(Millions of Dollars) | 2021 |  | 2020 |  | 2021 |  | 2020
CET Gas investment in Stagecoach Gas Services LLC | $— |  |  | $845 |  | $— |  |  | $— |
CET Gas investment in Mountain Valley Pipeline, LLC (a) | 111 |  | 342 |  | — |  |  | — |
Supplemental retirement income plan assets (b) | 525 |  | 465 |  | 499 |  | 439
Deferred income plan assets | 102 |  | 92 |  | 102 |  | 92
CET Electric investment in New York Transco, LLC (c) | 112 |  | 69 |  | — |  |  | — |
Other | 3 |  | 3 |  | 7 |  | 10
Total investments | $853 |  | $1,816 |  | $608 |  | $541
(a)At December 31, 2021 and 2020, CET Gas' cash investment in MVP was $530 million. In May 2021, the operator of the Mountain Valley Pipeline indicated that, subject to receipt of certain authorizations and resolution of certain challenges, it is targeting an in-service date for the project of summer 2022 at an overall project cost of approximately $6,200 million excluding allowance for funds used during construction. See "2020 and 2021 Partial Impairments of Investment in Mountain Valley Pipeline, LLC (MVP)" above. (b)See Note E. (c)CET Electric owns a 45.7 percent interest in New York Transco, LLC.
Research and Development Costs | Research and development costs were as follows:
| For the Years Ended December 31,
(Millions of Dollars) | 2021 |  | 2020 |  | 2019
Con Edison | $25 |  | $24 |  | $24
CECONY | 24 |  | 23 |  | 23
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) | 2021 |  | 2020 |  | 2019
Net income for common stock | $1,346 |  | $1,101 |  | $1,343
Weighted average common shares outstanding – basic | 348.4 |  | 334.8 |  | 328.5
Add: Incremental shares attributable to effect of potentially dilutive securities | 1.0 |  | 0.9 |  | 1.0
Adjusted weighted average common shares outstanding – diluted | 349.4 |  | 335.7 |  | 329.5
Net Income per common share – basic | $3.86 |  | $3.29 |  | $4.09
Net Income per common share – diluted | $3.85 |  | $3.28 |  | $4.08
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, 2018 (a) | $(16) |  | $(5)
OCI before reclassifications, net of tax of $(6) and $(1) for Con Edison and CECONY, respectively | (10) |  | (3)
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(2) for Con Edison (a)(b) | 7 |  | 2
Total OCI, net of taxes, at December 31, 2019 | (3) |  | (1)
Accumulated OCI, net of taxes, at December 31, 2019 (a) | $(19) |  | $(6)
OCI before reclassifications, net of tax of $4 and $1 for Con Edison and CECONY, respectively | (11) |  | (3) |
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(2) for Con Edison (a)(b) | 5 |  | 2
Total OCI, net of taxes, at December 31, 2020 | (6) |  | (1)
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 |  | $— |
(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, 2021 and 2020, cash, temporary cash investments and restricted cash for Con Edison and CECONY were as follows:
| At December 31,
| Con Edison |  | CECONY
(Millions of Dollars) | 2021 |  | 2020 |  | 2021 |  | 2020
Cash and temporary cash investments | $992 |  | $1,272 |  | $920 |  | $1,067
Restricted cash (a) | 154 |  | 164 |  | — |  |  | — |
Total cash, temporary cash investments and restricted cash | $1,146 |  | $1,436 |  | $920 |  | $1,067
(a)Restricted cash included cash of the Clean Energy Businesses' renewable electric project subsidiaries ($154 million and $164 million at December 31, 2021 and 2020, respectively) that, under the related project debt agreements, is restricted to being used for normal operating expenditures, debt service, and required reserves until the various maturity dates of the project debt.
Schedule of Cash and Cash Equivalents | At December 31, 2021 and 2020, cash, temporary cash investments and restricted cash for Con Edison and CECONY were as follows:
| At December 31,
| Con Edison |  | CECONY
(Millions of Dollars) | 2021 |  | 2020 |  | 2021 |  | 2020
Cash and temporary cash investments | $992 |  | $1,272 |  | $920 |  | $1,067
Restricted cash (a) | 154 |  | 164 |  | — |  |  | — |
Total cash, temporary cash investments and restricted cash | $1,146 |  | $1,436 |  | $920 |  | $1,067
(a)Restricted cash included cash of the Clean Energy Businesses' renewable electric project subsidiaries ($154 million and $164 million at December 31, 2021 and 2020, respectively) that, under the related project debt agreements, is restricted to being used for normal operating expenditures, debt service, and required reserves until the various maturity dates of the project debt.

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