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v3.23.1

Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Carrying amount |  |
Liabilities |  |
Carrying amount or fair value | $ 15,996 | $ 16,338
Fair value |  |
Liabilities |  |
Carrying amount or fair value | 14,965 | 14,990
Houston Electric | Carrying amount |  |
Liabilities |  |
Carrying amount or fair value | 7,245 | 6,353
Houston Electric | Fair value |  |
Liabilities |  |
Carrying amount or fair value | 6,556 | 5,504
CERC | Carrying amount |  |
Liabilities |  |
Carrying amount or fair value | 3,937 | 4,826
CERC | Fair value |  |
Liabilities |  |
Carrying amount or fair value | 3,840 | 4,637
Fair Value, Recurring |  |
Assets |  |
Equity securities | 548 | 510
Investments, including money market funds | 30 | 32
Total assets | 579 | 554
Liabilities |  |
Total liabilities | 617 | 578
Fair Value, Recurring | Houston Electric |  |
Assets |  |
Investments, including money market funds | 15 | 17
Total assets | 15 | 17
Fair Value, Recurring | CERC |  |
Assets |  |
Investments, including money market funds | 13 | 14
Total assets | 14 | 23
Fair Value, Recurring | Interest rate derivatives |  |
Assets |  |
Derivative assets | 0 | 1
Liabilities |  |
Derivative liabilities | 0 | 0
Fair Value, Recurring | Natural gas derivatives |  |
Assets |  |
Derivative assets | 1 | 11
Fair Value, Recurring | Natural gas derivatives | CERC |  |
Assets |  |
Derivative assets | 1 | 9
Fair Value, Recurring | Indexed debt securities derivative |  |
Liabilities |  |
Derivative liabilities | 617 | 578
Fair Value, Recurring | Level 1 |  |
Assets |  |
Equity securities | 548 | 510
Investments, including money market funds | 30 | 32
Total assets | 578 | 542
Liabilities |  |
Total liabilities | 0 | 0
Fair Value, Recurring | Level 1 | Houston Electric |  |
Assets |  |
Investments, including money market funds | 15 | 17
Total assets | 15 | 17
Fair Value, Recurring | Level 1 | CERC |  |
Assets |  |
Investments, including money market funds | 13 | 14
Total assets | 13 | 14
Fair Value, Recurring | Level 1 | Interest rate derivatives |  |
Assets |  |
Derivative assets | 0 | 0
Liabilities |  |
Derivative liabilities | 0 | 0
Fair Value, Recurring | Level 1 | Natural gas derivatives |  |
Assets |  |
Derivative assets | 0 | 0
Fair Value, Recurring | Level 1 | Natural gas derivatives | CERC |  |
Assets |  |
Derivative assets | 0 | 0
Fair Value, Recurring | Level 1 | Indexed debt securities derivative |  |
Liabilities |  |
Derivative liabilities | 0 | 0
Fair Value, Recurring | Level 2 |  |
Assets |  |
Equity securities | 0 | 0
Investments, including money market funds | 0 | 0
Total assets | 1 | 12
Liabilities |  |
Total liabilities | 617 | 578
Fair Value, Recurring | Level 2 | Houston Electric |  |
Assets |  |
Investments, including money market funds | 0 | 0
Total assets | 0 | 0
Fair Value, Recurring | Level 2 | CERC |  |
Assets |  |
Investments, including money market funds | 0 | 0
Total assets | 1 | 9
Fair Value, Recurring | Level 2 | Interest rate derivatives |  |
Assets |  |
Derivative assets | 0 | 1
Liabilities |  |
Derivative liabilities | 0 | 0
Fair Value, Recurring | Level 2 | Natural gas derivatives |  |
Assets |  |
Derivative assets | 1 | 11
Fair Value, Recurring | Level 2 | Natural gas derivatives | CERC |  |
Assets |  |
Derivative assets | 1 | 9
Fair Value, Recurring | Level 2 | Indexed debt securities derivative |  |
Liabilities |  |
Derivative liabilities | 617 | 578
Fair Value, Recurring | Level 3 |  |
Assets |  |
Equity securities | 0 | 0
Investments, including money market funds | 0 | 0
Total assets | 0 | 0
Liabilities |  |
Total liabilities | 0 | 0
Fair Value, Recurring | Level 3 | Houston Electric |  |
Assets |  |
Investments, including money market funds | 0 | 0
Total assets | 0 | 0
Fair Value, Recurring | Level 3 | CERC |  |
Assets |  |
Investments, including money market funds | 0 | 0
Total assets | 0 | 0
Fair Value, Recurring | Level 3 | Interest rate derivatives |  |
Assets |  |
Derivative assets | 0 | 0
Liabilities |  |
Derivative liabilities | 0 | 0
Fair Value, Recurring | Level 3 | Natural gas derivatives |  |
Assets |  |
Derivative assets | 0 | 0
Fair Value, Recurring | Level 3 | Natural gas derivatives | CERC |  |
Assets |  |
Derivative assets | 0 | 0
Fair Value, Recurring | Level 3 | Indexed debt securities derivative |  |
Liabilities |  |
Derivative liabilities | $ 0 | $ 0

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