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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