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Cash flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental disclosures of cash flow information      
Interest paid to non-affiliates $ 83 $ 84 $ 83
Income taxes paid (including refundable credits) 55 55 75
Income taxes refunded (including refundable credits) 1 45 55
Supplemental disclosures of noncash activities      
Unpaid invoices and accruals for capital expenditures (investing), Balance, end of period 38 84 70
Common stock dividends reinvested in HEI common stock (financing) 0 17 0
Loans transferred from held for investment to held for sale (investing) 41 24 0
Real estate acquired in settlement of loans (investing) 0 1 1
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) 0 1 5
Common stock issued (gross) for director and executive/management compensation (financing) 11 7 10
Obligations to fund low income housing investments, net (investing) 13 0 0
Hawaiian Electric Company, Inc. and Subsidiaries      
Supplemental disclosures of cash flow information      
Interest paid to non-affiliates 63 62 61
Income taxes paid (including refundable credits) 26 1 13
Income taxes refunded (including refundable credits) 0 20 12
Supplemental disclosures of noncash activities      
Unpaid invoices and accruals for capital expenditures (investing), Balance, end of period 38 0 70
Electric utility property, plant and equipment      
Estimated fair value of noncash contributions in aid of construction (investing) 18 28 3
Refinancing of long-term debt (financing) $ 0 $ 0 $ 47