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Fair Value Measurements - Schedule of Assets and Liabilities Measured On Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Liabilities |  |
Derivative Liability | $ 532 | $ 617
CERC |  |
Liabilities |  |
Derivative Liability | 10 | 11
Fair Value, Recurring |  |
Assets |  |
Equity securities | 458 | 541
Investments, including money market funds | 37 | 31
Interest rate derivatives | 3 | 0
Total assets | 498 | 572
Liabilities |  |
Total liabilities | 532 | 617
Fair Value, Recurring | Houston Electric |  |
Assets |  |
Investments, including money market funds | 21 | 14
Total assets | 21 | 14
Fair Value, Recurring | CERC |  |
Assets |  |
Investments, including money market funds | 15 | 15
Total assets | 15 | 15
Liabilities |  |
Total liabilities | 10 | 11
Fair Value, Recurring | Indexed debt securities derivative |  |
Liabilities |  |
Derivative Liability | 520 | 605
Fair Value, Recurring | Energy Related Derivative |  |
Liabilities |  |
Derivative Liability | 12 | 12
Fair Value, Recurring | Energy Related Derivative | CERC |  |
Liabilities |  |
Derivative Liability | 10 | 11
Level 1 | Fair Value, Recurring |  |
Assets |  |
Equity securities | 458 | 541
Investments, including money market funds | 37 | 31
Interest rate derivatives | 0 | 0
Total assets | 495 | 572
Liabilities |  |
Total liabilities | 0 | 0
Level 1 | Fair Value, Recurring | Houston Electric |  |
Assets |  |
Investments, including money market funds | 21 | 14
Total assets | 21 | 14
Level 1 | Fair Value, Recurring | CERC |  |
Assets |  |
Investments, including money market funds | 15 | 15
Total assets | 15 | 15
Liabilities |  |
Total liabilities | 0 | 0
Level 1 | Fair Value, Recurring | Indexed debt securities derivative |  |
Liabilities |  |
Derivative Liability | 0 | 0
Level 1 | Fair Value, Recurring | Energy Related Derivative |  |
Liabilities |  |
Derivative Liability | 0 | 0
Level 1 | Fair Value, Recurring | Energy Related Derivative | CERC |  |
Liabilities |  |
Derivative Liability | 0 | 0
Level 2 | Fair Value, Recurring |  |
Assets |  |
Equity securities | 0 | 0
Investments, including money market funds | 0 | 0
Interest rate derivatives | 3 | 0
Total assets | 3 | 0
Liabilities |  |
Total liabilities | 532 | 617
Level 2 | Fair Value, Recurring | Houston Electric |  |
Assets |  |
Investments, including money market funds | 0 | 0
Total assets | 0 | 0
Level 2 | Fair Value, Recurring | CERC |  |
Assets |  |
Investments, including money market funds | 0 | 0
Total assets | 0 | 0
Liabilities |  |
Total liabilities | 10 | 11
Level 2 | Fair Value, Recurring | Indexed debt securities derivative |  |
Liabilities |  |
Derivative Liability | 520 | 605
Level 2 | Fair Value, Recurring | Energy Related Derivative |  |
Liabilities |  |
Derivative Liability | 12 | 12
Level 2 | Fair Value, Recurring | Energy Related Derivative | CERC |  |
Liabilities |  |
Derivative Liability | 10 | 11
Level 3 | Fair Value, Recurring |  |
Assets |  |
Equity securities | 0 | 0
Investments, including money market funds | 0 | 0
Interest rate derivatives | 0 | 0
Total assets | 0 | 0
Liabilities |  |
Total liabilities | 0 | 0
Level 3 | Fair Value, Recurring | Houston Electric |  |
Assets |  |
Investments, including money market funds | 0 | 0
Total assets | 0 | 0
Level 3 | Fair Value, Recurring | CERC |  |
Assets |  |
Investments, including money market funds | 0 | 0
Total assets | 0 | 0
Liabilities |  |
Total liabilities | 0 | 0
Level 3 | Fair Value, Recurring | Indexed debt securities derivative |  |
Liabilities |  |
Derivative Liability | 0 | 0
Level 3 | Fair Value, Recurring | Energy Related Derivative |  |
Liabilities |  |
Derivative Liability | 0 | 0
Level 3 | Fair Value, Recurring | Energy Related Derivative | CERC |  |
Liabilities |  |
Derivative Liability | $ 0 | $ 0

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