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Cash flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Supplemental disclosures of cash flow information      
Interest paid to non-affiliates, net of amounts capitalized $ 170 $ 106 $ 98
Income taxes paid (net of refundable credits) 28 41 41
Income taxes refunded (including refundable credits) 1 2 7
Supplemental disclosures of noncash activities      
Electric utility property, plant and equipment-Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 43 68 48
Common stock dividends reinvested in HEI common stock (financing) 5 0 0
Loans transferred from held for investment to held for sale (investing) 106 0 61
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) 0 0 3
Transfer of retail repurchase agreements to deposit liabilities (financing) 98 0 0
Right-of-use assets obtained in exchange for operating lease obligations (investing) 1 51 44
Property, plant, equipment and other assets received in exchange for the assumption of debt associated with a business acquisition (investing) 0 68 0
Debt, lease liabilities and other liabilities assumed in business acquisition (financing) 0 68 0
Common stock issued (gross) for director and executive/management compensation (financing) 8 10 7
Obligations to fund low income housing investments, net (investing) 18 9 36
Transfer of securities from available for sale to held to maturities (investing) 0 755 0
Hawaiian Electric Company, Inc. and Subsidiaries      
Supplemental disclosures of cash flow information      
Interest paid to non-affiliates, net of amounts capitalized 74 69 71
Income taxes paid (net of refundable credits) 39 67 45
Income taxes refunded (including refundable credits) 2 0 5
Supplemental disclosures of noncash activities      
Electric utility property, plant and equipment-Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 42 64 43
Right-of-use assets obtained in exchange for operating lease obligations (investing) 0 44 44
Estimated fair value of noncash contributions in aid of construction (investing) 21 14 8
Increase related to an acquisition (investing) 0 15 0
Right-of-use assets obtained in exchange for finance lease obligations (financing) $ 294 $ 48 $ 0