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v3.25.1

Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 6 | $ 6
Interest cost | 20 | 19
Expected return on plan assets | (20) | (19)
Amortization of net loss | 7 | 7
Net periodic cost (benefit) | 13 | 13
Total contributions expected in current year | 112 |
Total contributions to the plans during the period | 63 |
Pension plans | Houston Electric |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total contributions expected in current year | 0 |
Total contributions to the plans during the period | 0 |
Pension plans | CERC |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total contributions expected in current year | 0 |
Total contributions to the plans during the period | 0 |
Postretirement benefit plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 3 | 3
Expected return on plan assets | (1) | (1)
Amortization of prior service cost (credit) | (1) | (1)
Amortization of net loss | (2) | (2)
Net periodic cost (benefit) | (1) | (1)
Total contributions expected in current year | 9 |
Total contributions to the plans during the period | 3 |
Postretirement benefit plans | Houston Electric |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 1 | 1
Expected return on plan assets | (1) | (1)
Amortization of prior service cost (credit) | (1) | (1)
Amortization of net loss | (1) | (1)
Net periodic cost (benefit) | (2) | (2)
Total contributions expected in current year | 1 |
Total contributions to the plans during the period | 0 |
Postretirement benefit plans | CERC |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 1 | 1
Expected return on plan assets | 0 | 0
Amortization of prior service cost (credit) | 1 | 1
Amortization of net loss | (1) | (1)
Net periodic cost (benefit) | 1 | $ 1
Total contributions expected in current year | 5 |
Total contributions to the plans during the period | $ 2 |

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