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Credit agreements, long-term debt and changes in long-term debt - Schedule of Line of Credit Facilities (Details) - Revolving Credit Facility - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Capacity | $ 645 | $ 664
Outstanding | 292 | 389
Undrawn | 353 | 275
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Line of Credit Facility [Line Items] |  |
Capacity | 545 | 564
Outstanding | 171 | 216
Undrawn | 374 | 348
Unsecured revolving line of credit |  |
Line of Credit Facility [Line Items] |  |
Capacity | 175 | 175
Outstanding | 121 | 173
Undrawn | 54 | 2
Unsecured revolving line of credit | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Line of Credit Facility [Line Items] |  |
Capacity | 200 | 200
Outstanding | 121 | 166
Undrawn | 79 | 34
ABL Facility | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Line of Credit Facility [Line Items] |  |
Capacity | 220 | 239
Outstanding | 0 | 0
Undrawn | 220 | 239
Borrowing from HEI - standing commitment letter | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Line of Credit Facility [Line Items] |  |
Capacity | 75 | 75
Outstanding | 0 | 0
Undrawn | 75 | 75
Short-term loan credit facility | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Line of Credit Facility [Line Items] |  |
Capacity | 50 | 50
Outstanding | 50 | 50
Undrawn | $ 0 | $ 0

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