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v3.23.1

Goodwill and Other Intangibles (CenterPoint Energy and CERC) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2020
Goodwill [Line Items] |  |  |  |
Goodwill | $ 4,294 |  | $ 4,294 |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount | 63 |  | 63 |
Accumulated Amortization | (26) |  | (25) |
Net Balance | 37 |  | 38 |
Finite-Lived Intangible Assets Amortization Expense Maturity Schedule [Abstract] |  |  |  |
Remaining nine months of 2023 | 5 |  |  |
2024 | 5 |  |  |
2025 | 5 |  |  |
2026 | 5 |  |  |
2027 | 4 |  |  |
2028 | 4 |  |  |
Depreciation and amortization expense |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Amortization expense of intangible assets recorded in Depreciation and amortization | 1 | $ 1 |  |
Customer relationships |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount | 33 |  | 33 |
Accumulated Amortization | (17) |  | (16) |
Net Balance | 16 |  | 17 |
Trade names |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount | 16 |  | 16 |
Accumulated Amortization | (6) |  | (6) |
Net Balance | 10 |  | 10 |
Operation and maintenance agreements |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount | 12 |  | 12 |
Accumulated Amortization | (2) |  | (2) |
Net Balance | 10 |  | 10 |
Other |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount | 2 |  | 2 |
Accumulated Amortization | (1) |  | (1) |
Net Balance | 1 |  | 1 |
CERC |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 1,583 |  | 1,583 |
Electric |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 936 |  | 936 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |
Accumulated goodwill impairment charge |  |  |  | $ 185
Natural Gas |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 2,920 |  | 2,920 |
Corporate and Other |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 438 |  | $ 438 |

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