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Electric utility segment - Regulatory proceedings (Details) $ in Thousands |  |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Feb. 16, 2021 agreement | Dec. 23, 2020 USD ($) | Sep. 15, 2020 agreement | Mar. 31, 2023 USD ($) MWh project contract | Nov. 30, 2021 agreement | Nov. 30, 2021 entity | Mar. 31, 2023 USD ($) contract project agreement | Dec. 31, 2022 USD ($) | Dec. 31, 2019 USD ($) agreement | Feb. 28, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 17, 2022 mechanism | Dec. 31, 2021 USD ($) | Jun. 01, 2021 mechanism | Mar. 23, 2021 mechanism | Dec. 31, 2020 entity | Jul. 09, 2020 agreement
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PUC proposal period |  | 45 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, modified pilot process proposal period |  |  |  | 15 days |  |  |  |  |  |  |  |  |  |  |  |  |
Propose pilots annual cap |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Potential total annual maximum reward |  |  |  | $ 2,000 |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |
Advanced metering infrastructure term |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of performance incentive mechanisms | mechanism |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 3 | 2 |  |
Number of performance incentive mechanisms, penalty-only | mechanism |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Multi-year rate period |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer dividend, negative adjustment percentage |  | 0.22% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Savings commitment liability, annual rate |  | $ 6,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings sharing mechanism, actual return on equity, dead band percentage above or below target |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage sharing between customers and utilities |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings sharing mechanism, actual earning, above or below dead band |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage sharing for any further difference |  |  |  | 90 |  |  |  |  |  |  |  |  |  |  |  |  |
MPIR and EPRM requested amount |  |  |  | $ 26,200 |  |  |  |  |  |  |  |  |  |  |  |  |
EPRM approved projects | contract |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |  |  |  |
EPRM approved projects, capital costs |  |  |  | $ 41,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of projects | project |  |  |  | 6 |  |  | 6 |  |  |  |  |  |  |  |  |  |
Estimated capital costs |  |  |  | $ 480,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2022 deferred cost recovery approved |  |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |
Decoupling order, service reliability performance, historical measurement period (in years) |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum penalty, percent of ROE |  |  |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Service reliability, pending adjusted maximum penalty amount |  |  |  | $ 6,800 |  |  |  |  |  |  |  |  |  |  |  |  |
Service reliability, estimated penalties |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |
Dead band percentage above or below the target |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Call center performance, maximum penalty percentage |  |  |  | 0.08% |  |  |  |  |  |  |  |  |  |  |  |  |
Call center performance, pending adjusted maximum penalty |  |  |  | $ 1,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement | 1 |  | 1 |  |  |  |  |  | 7 |  |  |  |  |  |  |  |
Incentives accrued |  |  |  |  |  |  |  |  | $ 1,700 |  |  |  | $ 100 |  |  |  |
Number of grid service purchase agreements | agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Number of PPAs approved |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |
Number of GSPAs approved | entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Number of power purchase agreements terminated | agreement |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Interpolated RPS rate goal, year one and two (in dollars per MWh) | MWh |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Interpolated RPS rate goal, year three (in dollars per MWh) | MWh |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |
Interpolated RPS rate goal, after year three (in dollars per MWh) | MWh |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
Failure to meet RPS targets, penalty rate (in dollars per MWh) | MWh |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Potential total annual maximum reward |  |  |  | $ 1,500 |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |
Public utilities, grid services procurement performance incentive mechanism, accrued estimated rewards |  |  |  |  |  |  |  | 40 |  |  |  |  |  |  |  |  |
Potential total annual maximum reward |  |  |  | 3,000 |  |  | 3,000 |  |  |  |  |  |  |  |  |  |
Total annual maximum penalty |  |  |  | 900 |  |  | 900 |  |  |  |  |  |  |  |  |  |
Interconnection approval PIM, accrued estimated rewards |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Performance incentive mechanism, maximum reward |  |  |  | $ 2,000 |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |
Performance incentive mechanism, term |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Performance incentive mechanism, accrued estimated rewards |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |
Target performance historical measurement period |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of return on equity |  |  |  | 0.03% |  |  |  |  |  |  |  |  |  |  |  |  |
Pending adjusted amount |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Target performance period |  |  |  | 10 months |  |  |  |  |  |  |  |  |  |  |  |  |
Target deadband period |  |  |  | 2 months |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued earned rewards, net of penalties |  |  |  |  |  |  |  | 3,400 |  |  |  |  |  |  |  |  |
Hawaiian Electric, Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities retained percentage |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued earned rewards, net of penalties |  |  |  |  |  |  |  | 2,500 |  |  |  |  |  |  |  |  |
Hawaii Electric Light Company, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued earned rewards, net of penalties |  |  |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |
Maui Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued earned rewards, net of penalties |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |
Schofield Generation Station | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MPIR requested amount |  |  |  | $ 16,500 |  |  |  |  |  |  |  |  |  |  |  |  |
West Loch PV Project | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MPIR requested amount |  |  |  | 3,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Grid Modernization Strategy Phase 1 Project | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MPIR requested amount |  |  |  | 6,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Waiawa UFLS Project | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EPRM requested amount |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |

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