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Schedule I - Condensed Financial Information - Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
NET CASH FLOWS FROM OPERATING ACTIVITIES | $ 2,156 | $ 3,935 | $ 2,733
INVESTING ACTIVITIES |  |  |
Proceeds from sale of the Clean Energy Businesses, net of cash and cash equivalents sold | 3,927 | 0 | 629
NET CASH FLOWS USED IN INVESTING ACTIVITIES | (1,003) | (4,565) | (3,484)
FINANCING ACTIVITIES |  |  |
Net (payment)/issuance of short-term debt | (752) | 1,702 | (382)
Retirement of long-term debt | (710) | (406) | (1,960)
Debt issuance costs | (32) | (13) | (40)
Repurchase of common shares | (1,000) | 0 | 0
Issuance of common shares for stock plans | 56 | 57 | 60
Issuance of common shares - public offering | 0 | 0 | 775
Common stock dividends | (1,096) | (1,089) | (1,030)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES | (1,488) | 1,014 | 461
NET CHANGE FOR THE PERIOD | (335) | 384 | (290)
BALANCE AT BEGINNING OF PERIOD | 1,530 | 1,146 | 1,436
BALANCE AT END OF PERIOD | 1,195 | 1,530 | 1,146
CECONY |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
NET CASH FLOWS FROM OPERATING ACTIVITIES | 2,285 | 3,263 | 2,186
INVESTING ACTIVITIES |  |  |
NET CASH FLOWS USED IN INVESTING ACTIVITIES | (4,439) | (3,926) | (3,729)
FINANCING ACTIVITIES |  |  |
Net (payment)/issuance of short-term debt | (397) | 939 | (299)
Retirement of long-term debt | 0 | 0 | (640)
Debt issuance costs | (31) | (12) | (27)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES | 2,236 | 799 | 1,396
NET CHANGE FOR THE PERIOD | 82 | 136 | (147)
BALANCE AT BEGINNING OF PERIOD | 1,056 | 920 | 1,067
BALANCE AT END OF PERIOD | 1,138 | 1,056 | 920
Parent Company |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
NET CASH FLOWS FROM OPERATING ACTIVITIES | 772 | 1,015 | 1,459
INVESTING ACTIVITIES |  |  |
Contributions to subsidiaries | (1,854) | (150) | (1,135)
Debt receivable from affiliated companies | 0 | 0 | 875
Proceeds from sale of the Clean Energy Businesses, net of cash and cash equivalents sold | 3,927 | 0 | 0
NET CASH FLOWS USED IN INVESTING ACTIVITIES | 2,073 | (150) | (260)
FINANCING ACTIVITIES |  |  |
Net (payment)/issuance of short-term debt | (343) | 632 | 50
Retirement of long-term debt | (650) | (293) | (1,178)
Debt issuance costs | 0 | 0 | (1)
Repurchase of common shares | (1,000) | 0 | 0
Issuance of common shares for stock plans | 56 | 57 | 60
Issuance of common shares - public offering | 0 | 0 | 775
Common stock dividends | (1,096) | (1,089) | (1,030)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES | (3,033) | (693) | (1,324)
NET CHANGE FOR THE PERIOD | (188) | 172 | (125)
BALANCE AT BEGINNING OF PERIOD | 191 | 19 | 144
BALANCE AT END OF PERIOD | $ 3 | $ 191 | $ 19

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-24 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-24 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 1 -SubTopic 230 -Topic 830 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481877/830-230-45-1 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-24 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-24 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-24 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-25 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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