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v3.24.3

Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 6 | $ 6 | $ 18 | $ 19
Interest cost | 18 | 19 | 55 | 57
Expected return on plan assets | (19) | (19) | (56) | (57)
Amortization of net loss | 7 | 7 | 21 | 21
Net periodic cost (benefit) | 12 | 13 | 38 | 40
Total contributions expected in current year | 11 |  | 11 |
Total contributions to the plans during the period | 2 |  | 5 |
Pension plans | Houston Electric |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total contributions expected in current year | 0 |  | 0 |
Total contributions to the plans during the period | 0 |  | 0 |
Pension plans | CERC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total contributions expected in current year | 0 |  | 0 |
Total contributions to the plans during the period | 0 |  | 0 |
Postretirement benefit plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  |  | 1 | 1
Interest cost | 3 | 3 | 9 | 9
Expected return on plan assets | (1) | (1) | (4) | (4)
Amortization of prior service cost (credit) | (1) | (1) | (2) | (2)
Amortization of net loss | (2) | (2) | (6) | (6)
Net periodic cost (benefit) | (1) | (1) | (2) | (2)
Total contributions expected in current year | 8 |  | 8 |
Total contributions to the plans during the period | 2 |  | 6 |
Postretirement benefit plans | Houston Electric |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  |  | 0 | 0
Interest cost | 1 | 1 | 4 | 4
Expected return on plan assets | (1) | (1) | (3) | (3)
Amortization of prior service cost (credit) | (1) | (1) | (4) | (4)
Amortization of net loss | (1) | (1) | (3) | (3)
Net periodic cost (benefit) | (2) | (2) | (6) | (6)
Total contributions expected in current year | 1 |  | 1 |
Total contributions to the plans during the period | 0 |  | 0 |
Postretirement benefit plans | CERC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  |  | 0 | 0
Interest cost | 1 | 1 | 3 | 3
Expected return on plan assets | (1) | 0 | (1) | 0
Amortization of prior service cost (credit) | 1 | 1 | 2 | 2
Amortization of net loss | (1) | (1) | (2) | (2)
Net periodic cost (benefit) | 0 | $ 1 | 2 | $ 3
Total contributions expected in current year | 4 |  | 4 |
Total contributions to the plans during the period | $ 1 |  | $ 4 |

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