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Schedule I - Condensed Financial Information - Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net Income |  | $ 1,660 | $ 1,346 | $ 1,101
Deferred income taxes | $ 121 | 435 | 133 | 85
Change in Assets and Liabilities: |  |  |  |
Other – net (b) |  | 31 | (234) | (179)
NET CASH FLOWS FROM OPERATING ACTIVITIES |  | 3,935 | 2,733 | 2,198
INVESTING ACTIVITIES |  |  |  |
NET CASH FLOWS USED IN INVESTING ACTIVITIES |  | (4,565) | (3,484) | (4,224)
FINANCING ACTIVITIES |  |  |  |
Net proceeds of short-term debt |  | 1,702 | (382) | 178
Issuance of long-term debt |  | 800 | 2,804 | 2,925
Retirement of long-term debt |  | (406) | (1,960) | (518)
Debt issuance costs |  | (13) | (40) | (47)
Issuance of common shares for stock plans |  | 57 | 60 | 58
Issuance of common shares - public offering |  | 0 | 775 | 640
Common stock dividends |  | (1,089) | (1,030) | (975)
NET CASH FLOWS FROM FINANCING ACTIVITIES |  | 1,014 | 461 | 2,245
NET CHANGE FOR THE PERIOD |  | 384 | (290) | 219
BALANCE AT BEGINNING OF PERIOD |  | 1,146 | 1,436 | 1,217
BALANCE AT END OF PERIOD | 1,530 | 1,530 | 1,146 | 1,436
CECONY |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net Income |  | 1,390 | 1,344 | 1,185
Deferred income taxes |  | 85 | 124 | 168
Change in Assets and Liabilities: |  |  |  |
Accounts receivable from affiliated companies |  | 8 | (96) | 61
Accrued taxes to affiliated companies |  | 79 | 9 | 1
Accounts payable to affiliated companies |  | (1) | (4) | 9
Other – net (b) |  | 56 | (354) | (98)
NET CASH FLOWS FROM OPERATING ACTIVITIES |  | 3,263 | 2,186 | 1,693
INVESTING ACTIVITIES |  |  |  |
NET CASH FLOWS USED IN INVESTING ACTIVITIES |  | (3,926) | (3,729) | (3,416)
FINANCING ACTIVITIES |  |  |  |
Net proceeds of short-term debt |  | 939 | (299) | 523
Issuance of long-term debt |  | 700 | 2,250 | 2,200
Retirement of long-term debt |  | 0 | (640) | (350)
Debt issuance costs |  | (12) | (27) | (34)
NET CASH FLOWS FROM FINANCING ACTIVITIES |  | 799 | 1,396 | 1,857
NET CHANGE FOR THE PERIOD |  | 136 | (147) | 134
BALANCE AT BEGINNING OF PERIOD |  | 920 | 1,067 | 933
BALANCE AT END OF PERIOD | 1,056 | 1,056 | 920 | 1,067
Parent Company |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net Income |  | 1,660 | 1,346 | 1,101
Equity in earnings of subsidiaries |  | (1,860) | (1,369) | (1,105)
Deferred income taxes |  | 163 | 119 | 32
Change in Assets and Liabilities: |  |  |  |
Accounts receivable from affiliated companies |  | (138) | 57 | (386)
Accrued taxes to affiliated companies |  | (1) | (1) | (78)
Accounts payable to affiliated companies |  | 1 | 1 | 0
Other – net (b) |  | 56 | 50 | (89)
NET CASH FLOWS FROM OPERATING ACTIVITIES |  | 1,015 | 1,459 | 538
INVESTING ACTIVITIES |  |  |  |
Contributions to subsidiaries |  | (150) | (1,135) | (626)
Debt receivable from affiliated companies |  | 0 | 875 | 400
NET CASH FLOWS USED IN INVESTING ACTIVITIES |  | (150) | (260) | (226)
FINANCING ACTIVITIES |  |  |  |
Net proceeds of short-term debt |  | 632 | 50 | (537)
Issuance of long-term debt |  | 0 | 0 | 650
Retirement of long-term debt |  | (293) | (1,178) | (3)
Debt issuance costs |  | 0 | (1) | (3)
Issuance of common shares for stock plans |  | 57 | 60 | 58
Issuance of common shares - public offering |  | 0 | 775 | 640
Common stock dividends |  | (1,089) | (1,030) | (975)
NET CASH FLOWS FROM FINANCING ACTIVITIES |  | (693) | (1,324) | (170)
NET CHANGE FOR THE PERIOD |  | 172 | (125) | 142
BALANCE AT BEGINNING OF PERIOD |  | 19 | 144 | 2
BALANCE AT END OF PERIOD | $ 191 | 191 | 19 | 144
Parent Company | Revision of Prior Period, Adjustment |  |  |  |
FINANCING ACTIVITIES |  |  |  |
Retirement of long-term debt |  |  | (1,175) |
Parent Company | CECONY |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Dividends received |  | 978 | 988 | 982
Parent Company | O&R |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Dividends received |  | 57 | 52 | 49
Parent Company | Clean Energy Businesses |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Dividends received |  | 98 | 64 | 21
Parent Company | Con Edison Transmission |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Dividends received |  | $ 1 | $ 152 | $ 11

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