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Other Postretirement Benefits - Periodic Postretirement Benefit Costs (Details) - Other Postretirement Benefits - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - including administrative expenses | $ 3 | $ 4
Interest cost on projected other postretirement benefit obligation | 12 | 14
Expected return on plan assets | (17) | (18)
Recognition of net actuarial gain | (5) | (4)
TOTAL PERIODIC OTHER POSTRETIREMENT CREDIT | (7) | (4)
Cost capitalized | (2) | (2)
Reconciliation to rate level | 4 | 1
Total credit recognized | (5) | (5)
CECONY | Subsidiaries |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - including administrative expenses | 3 | 3
Interest cost on projected other postretirement benefit obligation | 10 | 12
Expected return on plan assets | (14) | (14)
Recognition of net actuarial gain | (3) | (2)
TOTAL PERIODIC OTHER POSTRETIREMENT CREDIT | (4) | (1)
Cost capitalized | (1) | (1)
Reconciliation to rate level | 2 | 0
Total credit recognized | $ (3) | $ (2)

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