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Cash flows (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates, net of amounts capitalized $ 47 $ 51
Income taxes paid (including refundable credits) 14 14
Income taxes refunded (including refundable credits) 2 0
Supplemental disclosures of noncash activities    
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 25 31
Increase related to an acquisition (investing) 15 0
Right-of-use assets obtained in exchange for operating lease obligations (investing) 40 38
Common stock issued (gross) for director and executive/management compensation (financing) 9 7
Obligations to fund low income housing investments (investing) 0 9
Loans transferred from held for investment to held for sale (investing) 0 62
Hawaiian Electric Company, Inc. and Subsidiaries    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates, net of amounts capitalized 34 37
Income taxes paid (including refundable credits) 27 20
Supplemental disclosures of noncash activities    
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 22 27
Increase related to an acquisition (investing) 15 0
Right-of-use assets obtained in exchange for operating lease obligations (investing) $ 37 $ 38