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Cash flows (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates $ 61 $ 61
Income taxes paid 19 62
Income taxes refunded 45 55
Supplemental disclosures of noncash activities    
Common stock dividends reinvested in HEI common stock (financing) 17 0
Loans transferred from held for investment to held for sale (investing) 14 0
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) 1 5
Obligations to fund low income housing investments (operating) 14 1
Additions to electric utility property, plant and equipment - unpaid invoices and accruals (investing) (7) 1
Hawaiian Electric Company, Inc. and Subsidiaries    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates 43 43
Income taxes paid 0 13
Income taxes refunded 20 12
Supplemental disclosures of noncash activities    
Additions to electric utility property, plant and equipment - unpaid invoices and accruals (investing) $ (7) $ 1