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Cash flows (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates $ 45 $ 46
Income taxes paid (including refundable credits) 36 21
Supplemental disclosures of noncash activities    
Estimated fair value of noncash contributions in aid of construction (investing) 5 2
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) 42 38
Loans transferred from held for investment to held for sale (investing) 1 9
Common stock issued (gross) for director and executive/management compensation (financing) 4 11
Obligations to fund low income housing investments (investing) 6 0
Transfer of retail repurchase agreements to deposit liabilities (financing) 102 0
Unsettled trades to purchase investment securities (investing) 10 0
Hawaiian Electric Company, Inc. and Subsidiaries    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates 32 36
Income taxes paid (including refundable credits) 35 8
Supplemental disclosures of noncash activities    
Estimated fair value of noncash contributions in aid of construction (investing) 5 2
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) $ 28 $ 36