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Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
General payment period | 30 days |  |
Revenues from contracts with customers | $ 2,521,425 | $ 2,269,451 |
Revenues from other sources | 328,954 | 310,324 |
Total revenues | 2,850,379 | 2,579,775 | $ 2,873,948
Services/goods transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 46,658 | 38,887 |
Services/goods transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 2,474,767 | 2,230,564 |
Electric energy sales - residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 830,653 | 766,609 |
Electric energy sales - commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 791,424 | 703,516 |
Electric energy sales - large light and power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 837,834 | 751,464 |
Electric energy sales - other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 10,770 | 8,054 |
Bank fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 46,658 | 38,887 |
Other sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 4,086 | 921 |
Regulatory revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 40,069 | 11,869 |
Bank interest and dividend income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 242,266 | 244,663 |
Other bank noninterest income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 17,474 | 29,961 |
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 29,145 | 23,831 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue taxes, other than income tax expense | 226,000 | 202,000 | 226,000
Revenue taxes accrued | 128,000 | 111,000 |
Electric utility |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 2,470,681 | 2,229,643 |
Revenues from other sources | 68,955 | 35,677 |
Total revenues | 2,539,636 | 2,265,320 | 2,545,942
Electric utility | Services/goods transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Electric utility | Services/goods transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 2,470,681 | 2,229,643 |
Electric utility | Electric energy sales - residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 830,653 | 766,609 |
Electric utility | Electric energy sales - commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 791,424 | 703,516 |
Electric utility | Electric energy sales - large light and power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 837,834 | 751,464 |
Electric utility | Electric energy sales - other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 10,770 | 8,054 |
Electric utility | Bank fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Electric utility | Other sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Electric utility | Regulatory revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 40,069 | 11,869 |
Electric utility | Bank interest and dividend income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 0 | 0 |
Electric utility | Other bank noninterest income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 0 | 0 |
Electric utility | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 28,886 | 23,808 |
Bank |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 46,658 | 38,887 |
Revenues from other sources | 259,740 | 274,624 |
Total revenues | 306,398 | 313,511 | 327,917
Bank | Services/goods transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 46,658 | 38,887 |
Bank | Services/goods transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Bank | Electric energy sales - residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Bank | Electric energy sales - commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Bank | Electric energy sales - large light and power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Bank | Electric energy sales - other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Bank | Bank fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 46,658 | 38,887 |
Bank | Other sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Bank | Regulatory revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 0 | 0 |
Bank | Bank interest and dividend income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 242,266 | 244,663 |
Bank | Other bank noninterest income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 17,474 | 29,961 |
Bank | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 0 | 0 |
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 4,086 | 921 |
Revenues from other sources | 259 | 23 |
Total revenues | 4,345 | 944 | $ 89
Other | Services/goods transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Other | Services/goods transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 4,086 | 921 |
Other | Electric energy sales - residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Other | Electric energy sales - commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Other | Electric energy sales - large light and power |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Other | Electric energy sales - other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Other | Bank fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 |
Other | Other sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 4,086 | 921 |
Other | Regulatory revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 0 | 0 |
Other | Bank interest and dividend income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 0 | 0 |
Other | Other bank noninterest income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | 0 | 0 |
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from other sources | $ 259 | $ 23 |

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