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Other Postretirement Benefits - Net Periodic Postretirement Benefit Costs (Details) - Other Postretirement Benefits - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 13 | $ 14 | $ 18
Interest cost on accumulated other postretirement benefit obligation | 47 | 57 | 35
Expected return on plan assets | (68) | (70) | (72)
Recognition of net actuarial loss/(gain) | (20) | (16) | (14)
Recognition of prior service credit | (1) | (2) | (1)
TOTAL PERIODIC POSTRETIREMENT BENEFIT COST/(CREDIT) | (29) | (17) | (34)
Cost capitalized | (6) | (6) | (8)
Reconciliation to rate level | 16 | 4 | 29
Total credit recognized | (19) | (19) | (13)
CECONY |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 10 | 12 | 15
Interest cost on accumulated other postretirement benefit obligation | 40 | 49 | 30
Expected return on plan assets | (55) | (56) | (58)
Recognition of net actuarial loss/(gain) | (13) | (8) | (9)
Recognition of prior service credit | 0 | 0 | 0
TOTAL PERIODIC POSTRETIREMENT BENEFIT COST/(CREDIT) | (18) | (3) | (22)
Cost capitalized | (5) | (5) | (7)
Reconciliation to rate level | 13 | (2) | 24
Total credit recognized | $ (10) | $ (10) | $ (5)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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