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Cash flows (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates, net of amounts capitalized $ 61 $ 64
Income taxes paid (including refundable credits) 34 23
Supplemental disclosures of noncash activities    
Estimated fair value of noncash contributions in aid of construction (investing) 5 9
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 30 32
Reduction of long-term debt from funds previously transferred for repayment (financing) 0 82
Right-of-use assets obtained in exchange for operating lease obligations (investing) 44 22
Common stock issued (gross) for director and executive/management compensation (financing) 7 16
Obligations to fund low income housing investments (investing) 9 10
Loans transferred from held for investment to held for sale (investing) 62 0
Hawaiian Electric Company, Inc. and Subsidiaries    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates, net of amounts capitalized 43 39
Income taxes paid (including refundable credits) 20 29
Supplemental disclosures of noncash activities    
Estimated fair value of noncash contributions in aid of construction (investing) 5 9
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 27 28
Reduction of long-term debt from funds previously transferred for repayment (financing) 0 82
Right-of-use assets obtained in exchange for operating lease obligations (investing) $ 44 $ 16