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Cash flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental disclosures of cash flow information      
Interest paid to non-affiliates, net of amounts capitalized $ 102,000 $ 83,000 $ 84,000
Income taxes paid (including refundable credits) 72,000 55,000 55,000
Income taxes refunded (including refundable credits) 34,000 1,000 45,000
Supplemental disclosures of noncash activities      
Unpaid invoices and accruals for capital expenditures (investing), Balance, end of period 59,000 38,000 84,000
Common stock dividends reinvested in HEI common stock (financing) 0 0 17,000
Loans transferred from held for investment to held for sale (investing) 1,000 41,000 24,000
Real estate acquired in settlement of loans (investing) 0 0 1,000
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) 0 0 1,000
Common stock issued (gross) for director and executive/management compensation (financing) 4,000 11,000 7,000
Obligations to fund low income housing investments, net (investing) 12,000 13,000 0
Transfer of retail repurchase agreements to deposit liabilities (financing) 102,000 0 0
Hawaiian Electric Company, Inc. and Subsidiaries      
Supplemental disclosures of cash flow information      
Interest paid to non-affiliates, net of amounts capitalized 73,000 63,000 62,000
Income taxes paid (including refundable credits) 64,000 26,000 1,000
Income taxes refunded (including refundable credits) 31,000 0 20,000
Supplemental disclosures of noncash activities      
Unpaid invoices and accruals for capital expenditures (investing), Balance, end of period 44,000 38,000 84,000
Estimated fair value of noncash contributions in aid of construction (investing) 14,000 18,000 28,000
Acquisition of Hawaiian Telcom’s interest in joint poles (investing) $ 48 $ 0 $ 0