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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassifications out of accumulated other comprehensive income/(loss)        
Revenues $ 0 $ (9,275) $ (528) $ (9,275)
Total reclassifications (64,345) (49,360) (129,176) (83,253)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 197 (1,107) 9 (559)
Hawaiian Electric Company, Inc. and Subsidiaries        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications (42,400) (42,828) (86,257) (67,232)
Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 35 25 69 51
Net realized gains on securities included in net income | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Revenues 0 (1,638) (387) (1,638)
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 6,008 5,690 12,018 11,396
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost | Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 5,846 5,184 11,691 10,368
Impact of D&Os of the PUC included in regulatory assets | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications (5,811) (5,159) (11,622) (10,317)
Impact of D&Os of the PUC included in regulatory assets | Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications $ (5,811) $ (5,159) $ (11,622) $ (10,317)