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Cash flows (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Supplemental disclosures of cash flow information    
Interest paid $ 41 $ 44
Income taxes paid 35 22
Income taxes refunded 55 24
Supplemental disclosures of noncash activities    
Increases in common stock related to director and officer compensatory plans (financing) 0 2
Real estate acquired in settlement of loans (investing) 0 2
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) 5 0
Obligations to fund low income housing investments (operating) 0 8
Hawaiian Electric Company, Inc. and Subsidiaries    
Supplemental disclosures of cash flow information    
Interest paid 30 31
Income taxes paid 9 6
Income taxes refunded 12 8
Supplemental disclosures of noncash activities    
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing) $ 53 $ 28