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Schedule I - Condensed Financial Information - Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net Income | $ 1,101 | $ 1,343 | $ 1,382 | $ 1,525
Change in Assets: |  |  |  |
Taxes receivable | (6) | 29 | 27 |
Other – net | (134) | 54 | (62) |
NET CASH FLOWS FROM OPERATING ACTIVITIES | 2,198 | 3,134 | 2,695 |
INVESTING ACTIVITIES |  |  |  |
NET CASH FLOWS USED IN INVESTING ACTIVITIES | (4,224) | (3,782) | (5,471) |
FINANCING ACTIVITIES |  |  |  |
Net proceeds of short-term debt | 178 | (874) | 1,989 |
Issuance of long-term debt | 2,925 | 3,017 | 3,030 |
Retirement of long-term debt | (518) | (1,195) | (1,938) |
Debt issuance costs | (47) | (32) | (61) |
Issuance of common shares for stock plans | 58 | 54 | 53 |
Issuance of common shares - public offering | 640 | 825 | 705 |
Common stock dividends | (975) | (924) | (842) |
NET CASH FLOWS FROM FINANCING ACTIVITIES | 2,245 | 859 | 2,938 |
NET CHANGE FOR THE PERIOD | 219 | 211 | 162 |
BALANCE AT BEGINNING OF PERIOD | 1,217 | 1,006 | 844 |
BALANCE AT END OF PERIOD | 1,436 | 1,217 | 1,006 | 844
CECONY |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net Income | 1,185 | 1,250 | 1,196 |
Change in Assets: |  |  |  |
Other – net | (49) | 54 | (96) |
NET CASH FLOWS FROM OPERATING ACTIVITIES | 1,693 | 2,502 | 2,204 |
INVESTING ACTIVITIES |  |  |  |
NET CASH FLOWS USED IN INVESTING ACTIVITIES | (3,416) | (3,124) | (3,306) |
FINANCING ACTIVITIES |  |  |  |
Net proceeds of short-term debt | 523 | (55) | 1,042 |
Issuance of long-term debt | 2,200 | 1,300 | 2,740 |
Retirement of long-term debt | (350) | (475) | (1,836) |
Debt issuance costs | (34) | (21) | (30) |
NET CASH FLOWS FROM FINANCING ACTIVITIES | 1,857 | 737 | 1,190 |
NET CHANGE FOR THE PERIOD | 134 | 115 | 88 |
BALANCE AT BEGINNING OF PERIOD | 933 | 818 | 730 |
BALANCE AT END OF PERIOD | 1,067 | 933 | 818 | 730
Parent Company |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net Income | 1,101 | 1,343 | 1,382 |
Equity in earnings of subsidiaries | (1,105) | (1,354) | (1,447) |
Change in Assets: |  |  |  |
Special deposits | 0 | (3) | (8) |
Taxes receivable |  | 25 | 2 |
Other – net | 654 | 44 | 187 |
NET CASH FLOWS FROM OPERATING ACTIVITIES | 1,713 | 1,029 | 1,033 |
INVESTING ACTIVITIES |  |  |  |
Contributions to subsidiaries | (626) | (930) | (1,110) |
Debt receivable from affiliated companies | 400 | 450 | (825) |
NET CASH FLOWS USED IN INVESTING ACTIVITIES | (226) | (480) | (1,935) |
FINANCING ACTIVITIES |  |  |  |
Net proceeds of short-term debt | (537) | (783) | 164 |
Issuance of long-term debt | 650 | 825 | 825 |
Retirement of long-term debt | (1,178) | (553) | (3) |
Debt issuance costs | (3) | 0 | 0 |
Issuance of common shares for stock plans | 58 | 54 | 53 |
Issuance of common shares - public offering | 640 | 825 | 705 |
Common stock dividends | (975) | (924) | (842) |
NET CASH FLOWS FROM FINANCING ACTIVITIES | (1,345) | (556) | 902 |
NET CHANGE FOR THE PERIOD | 142 | (7) | 0 |
BALANCE AT BEGINNING OF PERIOD | 2 | 9 | 9 |
BALANCE AT END OF PERIOD | 144 | 2 | 9 | $ 9
Parent Company | CECONY |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Dividends received | 982 | 912 | 846 |
Parent Company | O&R |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Dividends received | 49 | 47 | 46 |
Parent Company | Clean Energy Businesses |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Dividends received | 21 | 3 | 15 |
Parent Company | Con Edison Transmission |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Dividends received | $ 11 | $ 12 | $ 10 |

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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