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Electric utility segment - Power purchase agreements (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2021 | Jul. 31, 2018 MW | May 31, 2012 MW | Mar. 31, 1988 MW | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 1988 MW
Kalaeloa |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchase commitment, extension period | 10 years |  |  |  |  |  |  |  |
Purchase commitment, price increase percentage |  |  |  |  | 69.00% |  |  |  |
AES Hawaii |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchase commitment, period (in years) |  |  |  | 30 years |  |  |  |  |
Minimum power volume required (in megawatts) | MW |  |  |  | 180 |  |  |  |  |
Hu Honua Bioenergy, LLC |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Minimum power volume required (in megawatts) | MW |  |  | 21.5 |  |  |  |  |  |
Molokai New Energy Partners |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Total contracted PV capacity (in megawatts) | MW |  | 4.88 |  |  |  |  |  |  |
Total contracted battery energy storage system capacity | MW |  | 3 |  |  |  |  |  |  |
Maximum power volume to be delivered (in megawatts) | MW |  | 2.64 |  |  |  |  |  |  |
Hawaiian Electric |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | $ 218 | $ 163 | $ 382 | $ 305 |
Hawaiian Electric | Kalaeloa |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | 83 | 49 | 143 | 86 |
Increased power purchase commitment capacity (in megawatts) | MW |  |  |  |  |  |  |  |  | 208
Hawaiian Electric | AES Hawaii |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | 34 | 36 | 61 | 66 |
Hawaiian Electric | HPOWER |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | 19 | 14 | 38 | 31 |
Hawaiian Electric | Hamakua Energy |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | 14 | 12 | 30 | 23 |
Hawaiian Electric | Puna Geothermal Venture |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | 14 | 7 | 24 | 11 |
Hawaiian Electric | Wind IPPs |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | 38 | 28 | 56 | 57 |
Hawaiian Electric | Solar IPPs |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | 13 | 16 | 26 | 28 |
Hawaiian Electric | Other IPPs |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | $ 3 | $ 1 | $ 4 | $ 3 |

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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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