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Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost – including administrative expenses | $ 44 | $ 40 | $ 133 | $ 122
Interest cost on projected benefit obligation | 160 | 162 | 481 | 486
Expected return on plan assets | (282) | (279) | (846) | (837)
Recognition of net actuarial gain | (1) | (58) | (4) | (174)
Recognition of prior service credit | (4) | (4) | (13) | (12)
TOTAL PERIODIC BENEFIT CREDIT | (83) | (139) | (249) | (415)
Cost capitalized | (22) | (19) | (68) | (61)
Reconciliation to rate level | 12 | 72 | 39 | 218
Total credit recognized | (93) | (86) | (278) | (258)
CECONY | Subsidiaries |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost – including administrative expenses | 42 | 38 | 126 | 113
Interest cost on projected benefit obligation | 151 | 153 | 453 | 458
Expected return on plan assets | (269) | (265) | (807) | (795)
Recognition of net actuarial gain | (2) | (55) | (5) | (164)
Recognition of prior service credit | (5) | (5) | (15) | (15)
TOTAL PERIODIC BENEFIT CREDIT | (83) | (134) | (248) | (403)
Cost capitalized | (21) | (18) | (65) | (58)
Reconciliation to rate level | 10 | 66 | 31 | 202
Total credit recognized | $ (94) | $ (86) | $ (282) | $ (259)

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