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Summary of Significant Accounting Policies and Other Matters (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Accounts Receivable, Allowance for Credit Loss | The table below presents a rollforward by major portfolio segment type for the year ended December 31, 2020:
| For the Year Ended December 31, 2020
| Con Edison |  | CECONY
(Millions of Dollars) | Accounts receivable - customers |  | Other receivables |  | Accounts receivable - customers |  | Other receivables
Allowance for credit losses |  |  |  |  |  |  |
Beginning Balance at January 1, 2020 | $70 |  | $4 |  | $65 |  | $3
Recoveries | 8 |  | — |  |  | 6 |  | — |
Write-offs | (54) |  | (2) |  | (50) |  | (1)
Reserve adjustments | 124 |  | 5 |  | 117 |  | 2
Ending Balance December 31, 2020 | $148 |  | $7 |  | $138 |  | $4
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) | 2020 |  | 2019 |  | 2018
Con Edison | $335 |  | $323 |  | $330
CECONY | 323 |  | 312 |  | 318
Capitalized Cost of Utility Plant | At December 31, 2020 and 2019, the capitalized cost of the Companies’ utility plant, net of accumulated depreciation, was as follows:
| Con Edison |  | CECONY
(Millions of Dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
Electric |  |  |  |  |  |  |
Generation | $572 |  | $591 |  | $572 |  | $591
Transmission | 3,786 |  | 3,634 |  | 3,496 |  | 3,380
Distribution | 21,481 |  | 20,676 |  | 20,366 |  | 19,602
General | 52 |  | 43 |  |  | 52 |  | 43 |
Gas (a) | 9,206 |  | 8,617 |  | 8,522 |  | 7,961
Steam | 1,854 |  | 1,813 |  | 1,854 |  | 1,813
General | 2,507 |  | 2,365 |  | 2,286 |  | 2,143
Held for future use | 92 |  | 75 |  | 84 |  | 67
Construction work in progress | 2,474 |  | 1,937 |  | 2,320 |  | 1,812
Net Utility Plant | $42,024 |  | $39,751 |  | $39,552 |  | $37,412
(a) Primarily distribution.
Schedule of Investment Assets | The following investment assets are included in the Companies' consolidated balance sheets at December 31, 2020 and 2019:
| Con Edison |  | CECONY
(Millions of Dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
CET Gas investment in Stagecoach Gas Services, LLC | $845 |  | $924 |  | $— |  |  | $— |
CET Gas investment in Mountain Valley Pipeline, LLC (a) | 342 |  | 602 |  | — |  |  | — |
Supplemental retirement income plan assets (b) | 465 |  | 397 |  | 439 |  | 371
Deferred income plan assets | 92 |  | 81 |  | 92 |  | 81
CET Electric investment in New York Transco, LLC | 69 |  | 59 |  | — |  |  | — |
Other | 3 |  | 2 |  | 10 |  | 9
Total investments | $1,816 |  | $2,065 |  | $541 |  | $461
(a)At December 31, 2020 and 2019, CET Gas' cash investment in MVP was $530 million. In January 2021, the operator of the Mountain Valley Pipeline indicated that, subject to receipt of certain authorizations and resolution of certain challenges, it is continuing to target an in-service date for the Project of late 2021 at an overall Project cost of $5,800 million to $6,000 million, excluding allowance for funds used during construction. For the year ended December 31, 2020, CET Gas owned an 11.3 percent interest in MVP and reduced the carrying value of its investment in MVP from $662 million to $342 million by recognizing a noncash impairment loss of $320 million, pre-tax ($223 million, after tax), and based on total estimated Project costs and CET Gas’ previous capping of its cash contributions to the joint venture, its ownership interest in the joint venture is expected to be reduced to 8.8%. (b)See Note E.
Research and Development Costs | Research and development costs were as follows:
| For the Years Ended December 31,
(Millions of Dollars) | 2020 |  | 2019 |  | 2018
Con Edison | $24 |  | $24 |  | $24
CECONY | 23 |  | 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) | 2020 |  | 2019 |  | 2018
Net income for common stock | $1,101 |  | $1,343 |  | $1,382
Weighted average common shares outstanding – basic | 334.8 |  | 328.5 |  | 311.7
Add: Incremental shares attributable to effect of potentially dilutive securities | 0.9 |  | 1.0 |  | 1.2
Adjusted weighted average common shares outstanding – diluted | 335.7 |  | 329.5 |  | 312.9
Net Income per common share – basic | $3.29 |  | $4.09 |  | $4.43
Net Income per common share – diluted | $3.28 |  | $4.08 |  | $4.42
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, 2017 (a) | $(26) |  | $(6)
OCI before reclassifications, net of tax of $3 for Con Edison | 4 |  | — |
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(2) for Con Edison (a)(b) | 6 |  | 1
Total OCI, net of taxes, at December 31, 2018 | 10 |  | 1
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)
(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, 2020 and 2019, cash, temporary cash investments and restricted cash for Con Edison and CECONY were as follows:
| At December 31,
| Con Edison |  | CECONY
(Millions of Dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
Cash and temporary cash investments | $1,272 |  | $981 |  | $1,067 |  | $933
Restricted cash (a) | 164 |  | 236 |  | — |  |  | — |
Total cash, temporary cash investments and restricted cash | $1,436 |  | $1,217 |  | $1,067 |  | $933
(a)Restricted cash included cash of the Clean Energy Businesses' renewable electric production project subsidiaries ($164 million and $236 million at December 31, 2020 and 2019, respectively) that, under the related project debt agreements, is either restricted until the various maturity dates of the project debt to being used for normal operating expenses and capital expenditures, debt service, and required reserves or, for the December 31, 2019 amount, was restricted as a result of the PG&E bankruptcy. During the pendency of the PG&E bankruptcy, cash was not distributed from the related projects to the Clean Energy Businesses. In July 2020, PG&E's plan of reorganization became effective and the Clean Energy Businesses received previously restricted distributions and have resumed receiving distributions for all projects. See "Long-Lived and Intangible Assets,” above.
Schedule of Cash and Cash Equivalents | At December 31, 2020 and 2019, cash, temporary cash investments and restricted cash for Con Edison and CECONY were as follows:
| At December 31,
| Con Edison |  | CECONY
(Millions of Dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
Cash and temporary cash investments | $1,272 |  | $981 |  | $1,067 |  | $933
Restricted cash (a) | 164 |  | 236 |  | — |  |  | — |
Total cash, temporary cash investments and restricted cash | $1,436 |  | $1,217 |  | $1,067 |  | $933
(a)Restricted cash included cash of the Clean Energy Businesses' renewable electric production project subsidiaries ($164 million and $236 million at December 31, 2020 and 2019, respectively) that, under the related project debt agreements, is either restricted until the various maturity dates of the project debt to being used for normal operating expenses and capital expenditures, debt service, and required reserves or, for the December 31, 2019 amount, was restricted as a result of the PG&E bankruptcy. During the pendency of the PG&E bankruptcy, cash was not distributed from the related projects to the Clean Energy Businesses. In July 2020, PG&E's plan of reorganization became effective and the Clean Energy Businesses received previously restricted distributions and have resumed receiving distributions for all projects. See "Long-Lived and Intangible Assets,” above.

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