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Cash flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplemental disclosures of cash flow information      
Interest paid to non-affiliates $ 84,000 $ 83,000 $ 84,000
Income taxes paid 55,000 75,000 47,000
Income taxes refunded 45,000 55,000 24,000
Supplemental disclosures of noncash activities      
Unpaid invoices and other 14,000 5,000 43,000
Common stock dividends reinvested in HEI common stock (financing) 17,000 0 0
Loans transferred from held for investment to held for sale (investing) 24,000 0 0
Real estate acquired in settlement of loans (investing) 1,000 1,000 3,000
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) 1,000 5,000 0
Obligations to fund low income housing investments, net (operating) 14,000 4,000 14,000
Electric utility property, plant and equipment      
AFUDC-equity 8,325 6,928 6,771
Hawaiian Electric Company, Inc. and Subsidiaries      
Supplemental disclosures of cash flow information      
Interest paid to non-affiliates 62,000 61,000 61,000
Income taxes paid 1,000 13,000 6,000
Income taxes refunded 20,000 12,000 8,000
Supplemental disclosures of noncash activities      
Unpaid invoices and other 14,000 5,000 40,000
Electric utility property, plant and equipment      
AFUDC-equity 8,325 6,928 6,771
Estimated fair value of noncash contributions in aid of construction 28,000 3,000 3,000
Refinancing of long-term debt (financing) $ 0 $ 47,000 $ 0