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Cash flows (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates $ 43 $ 41
Income taxes paid 14 35
Income taxes refunded 45 55
Supplemental disclosures of noncash activities    
Common stock dividends reinvested in HEI common stock 11 0
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) 0 5
Obligations to fund low income housing investments (operating) 6 0
Additions to electric utility property, plant and equipment - unpaid invoices and accruals (investing) (32) (12)
Hawaiian Electric Company, Inc. and Subsidiaries    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates 31 30
Income taxes paid 0 9
Income taxes refunded $ 20 $ 12