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Other Postretirement Benefits - Periodic Postretirement Benefit Costs (Details) - Other Postretirement Benefits - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost - including administrative expenses | $ 3 | $ 4 | $ 6 | $ 7
Interest cost on projected other postretirement benefit obligation | 12 | 14 | 24 | 28
Expected return on plan assets | (17) | (18) | (34) | (35)
Recognition of net actuarial gain | (5) | (4) | (10) | (8)
Recognition of prior service credit |  |  | (1) | (1)
TOTAL PERIODIC OTHER POSTRETIREMENT CREDIT | (7) | (4) | (15) | (9)
Cost capitalized | (2) | (2) | (3) | (3)
Reconciliation to rate level | 4 | 1 | 8 | 2
Total credit recognized | (5) | (5) | (10) | (10)
CECONY |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Recognition of prior service credit |  |  | 0 | 0
CECONY | Subsidiaries |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost - including administrative expenses | 3 | 3 | 5 | 6
Interest cost on projected other postretirement benefit obligation | 10 | 12 | 20 | 25
Expected return on plan assets | (14) | (14) | (27) | (28)
Recognition of net actuarial gain | (4) | (2) | (7) | (4)
TOTAL PERIODIC OTHER POSTRETIREMENT CREDIT | (5) | (1) | (9) | (1)
Cost capitalized | (1) | (1) | (2) | (2)
Reconciliation to rate level | 3 | 0 | 6 | (2)
Total credit recognized | $ (3) | $ (2) | $ (5) | $ (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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