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Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost – including administrative expenses | $ 43 | $ 41
Interest cost on projected benefit obligation | 159 | 162
Expected return on plan assets | (282) | (279)
Recognition of net actuarial gain | (4) | (58)
Recognition of prior service credit | (4) | (4)
TOTAL PERIODIC BENEFIT CREDIT | (88) | (138)
Cost capitalized | (22) | (21)
Reconciliation to rate level | 18 | 73
Total credit recognized | (92) | (86)
CECONY | Subsidiaries |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost – including administrative expenses | 40 | 38
Interest cost on projected benefit obligation | 150 | 153
Expected return on plan assets | (269) | (265)
Recognition of net actuarial gain | (4) | (55)
Recognition of prior service credit | (5) | (5)
TOTAL PERIODIC BENEFIT CREDIT | (88) | (134)
Cost capitalized | (22) | (20)
Reconciliation to rate level | 16 | 68
Total credit recognized | $ (94) | $ (86)

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