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Cash flows (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates, net of amounts capitalized $ 62 $ 21
Income taxes paid (including refundable credits) 18 0
Supplemental disclosures of noncash activities    
Estimated fair value of noncash contributions in aid of construction (investing) 6 1
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 30 50
Right-of-use assets obtained in exchange for finance lease obligations (financing) 13 40
Right-of-use assets obtained in exchange for operating lease obligations (investing) 1 1
Common stock issued (gross) for director and executive/management compensation (financing) 3 7
Obligations to fund low income housing investments (investing) 0 7
Loans transferred from held for investment to held for sale (investing) 20 0
Hawaiian Electric Company, Inc. and Subsidiaries    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates, net of amounts capitalized 14 6
Income taxes paid (including refundable credits) 21 3
Supplemental disclosures of noncash activities    
Estimated fair value of noncash contributions in aid of construction (investing) 6 1
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 29 48
Right-of-use assets obtained in exchange for finance lease obligations (financing) 12 40
Common stock dividends payable (financing) $ 13 $ 0