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Electric utility segment - Regulatory Proceedings (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 07, 2020 USD ($) | Mar. 25, 2019 contract | Apr. 27, 2017 USD ($) | Dec. 31, 2019 USD ($) | May 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) $ / kWh | Aug. 31, 2019 USD ($)
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Decoupling order, service reliability performance, historical measurement period (in years) |  |  |  |  |  |  | 10 years |  |  |
Service reliability, pending adjusted maximum penalty amount |  |  |  |  |  |  | $ 6,800,000 |  |  |
Dead band percentage above or below the target |  |  |  |  |  |  | 3.00% |  |  |
Call center performance, pending adjusted maximum penalty |  |  |  |  |  |  | $ 1,400,000 |  |  |
Call center performance, maximum penalty amount |  |  |  |  |  | $ 2,100,000 |  |  |  |
Call center, additional penalty accrued |  |  |  |  | $ 1,300,000 |  |  |  |  |
Energy price, renewable projects with storage capacity (in dollars per kilowatt hour) | $ / kWh |  |  |  |  |  |  |  |  | 0.115 |
Energy price, renewable energy-only projects (in dollars per kilowatt hour) | $ / kWh |  |  |  |  |  |  |  |  | 0.095 |
Expected savings, phase 1, percent |  |  |  |  |  |  |  |  | 20.00% |
Performance incentive mechanism, incentive cap |  |  |  |  |  |  |  | $ 3,000,000 | $ 3,500,000 |
Expected savings, Phase 2, January 2019 |  |  |  |  |  |  |  |  | 15.00% |
Expected savings, Phase 2, February 2019 |  |  |  |  |  |  |  |  | 10.00% |
Expected savings, Phase 2, March 2019 |  |  |  |  |  |  |  |  | 5.00% |
Performance incentive mechanism penalty |  |  |  |  |  |  |  |  | $ 0 |
Number of contracts which qualified for incentives under Phase 1 | contract |  | 6 |  |  |  |  |  |  |  |
Incentives accrued |  |  |  |  |  |  |  |  |  | $ 12,900
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold of capital expenditures in excess of contributions |  |  | $ 2,500,000 |  |  |  |  |  |  |
MPIR requested amount | $ 24,200,000 |  |  |  |  |  |  | $ 19,800,000 | $ 3,600,000 |
Maximum penalty, percent of ROE |  |  |  |  |  |  | 0.20% |  |  |
Call center performance, maximum penalty percentage |  |  |  |  |  |  | 0.08% |  |  |
Call center performance, maximum penalty amount |  |  |  | $ 300,000 |  |  |  |  |  |
Grid Modernization Strategy Phase 1 Project | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
MPIR requested amount | 500,000 |  |  |  |  |  |  |  |  |
Schofield Generation Station | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
MPIR requested amount | 19,200,000 |  |  |  |  |  |  |  |  |
West Loch PV Project | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
MPIR requested amount | $ 4,500,000 |  |  |  |  |  |  |  |  |

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