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Cash flows (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates $ 20 $ 21
Income taxes paid 1 1
Income taxes refunded 45 47
Supplemental disclosures of noncash activities    
Common stock dividends reinvested in HEI common stock 6 0
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) 0 5
Additions to electric utility property, plant and equipment - unpaid invoices and accruals (investing) (48) (41)
Hawaiian Electric Company, Inc. and Subsidiaries    
Supplemental disclosures of cash flow information    
Interest paid to non-affiliates 12 13
Income taxes refunded $ 20 $ 6