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Cash flows (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Continuing Operations    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates, net of amounts capitalized $ 59 $ 65
Interest paid on finance lease obligations 19 14
Income taxes paid (including refundable credits) 19 17
Income taxes refunded (including refundable credits) 4 0
Supplemental disclosures of noncash activities    
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 58 26
Right-of-use assets obtained in exchange for finance lease obligations (financing) 42 108
Common stock issued (gross) for director and executive/management compensation (financing) 2 2
Debt assumed by buyer - sale of a subsidiary (financing) 39 0
Discontinued Operations    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates, net of amounts capitalized 0 68
Income taxes paid (including refundable credits) 0 1
Supplemental disclosures of noncash activities    
Common stock issued (gross) for director and executive/management compensation (financing) 0 1
Loans transferred from held for investment to held for sale (investing) 0 29
Right-of-use assets obtained in exchange for operating lease obligations (investing) 0 1
HEI consolidated (continuing operations) and Hawaiian Electric consolidated    
Supplemental disclosures of noncash activities    
Right-of-use assets obtained in exchange for operating lease obligations (investing) 10 0
Estimated fair value of noncash contributions in aid of construction (investing) 5 7
Reduction of long-term debt from funds previously transferred for repayment (financing) 47 0
Hawaiian Electric Company, Inc. and Subsidiaries    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates, net of amounts capitalized 41 44
Interest paid on finance lease obligations 19 14
Income taxes paid (including refundable credits) 29 27
Income taxes refunded (including refundable credits) 5 0
Supplemental disclosures of noncash activities    
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 58 25
Right-of-use assets obtained in exchange for finance lease obligations (financing) 42 107
Capital contribution from parent of a membership interest in an unconsolidated affiliate (financing) $ 287 $ 0