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Pension Benefits - Total Periodic Benefit Costs (Details) - Pension 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 | $ 46 | $ 41 | $ 89 | $ 80
Interest cost on projected benefit obligation | 162 | 162 | 321 | 324
Expected return on plan assets | (282) | (279) | (564) | (557)
Recognition of net actuarial loss (gain) | 1 | (58) | (3) | (115)
Recognition of prior service credit | (4) | (4) | (9) | (9)
TOTAL PERIODIC BENEFIT CREDIT | (77) | (138) | (166) | (277)
Cost capitalized | (23) | (21) | (46) | (42)
Reconciliation to rate level | 8 | 74 | 27 | 147
Total credit recognized | (92) | (85) | (185) | (172)
CECONY | Subsidiaries |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost – including administrative expenses | 43 | 38 | 84 | 75
Interest cost on projected benefit obligation | 152 | 153 | 302 | 305
Expected return on plan assets | (268) | (265) | (538) | (530)
Recognition of net actuarial loss (gain) | 1 | (55) | (4) | (109)
Recognition of prior service credit | (5) | (5) | (10) | (10)
TOTAL PERIODIC BENEFIT CREDIT | (77) | (134) | (166) | (269)
Cost capitalized | (22) | (20) | (43) | (39)
Reconciliation to rate level | 5 | 68 | 21 | 135
Total credit recognized | $ (94) | $ (86) | $ (188) | $ (173)

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