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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net cash provided by operating activities $ 420,441 $ 495,658 $ 356,858
Cash flows from investing activities      
Capital expenditures (495,187) (330,043) (363,804)
Other 6,468 856 7,940
Net cash used in investing activities (815,299) (736,465) (705,724)
Cash flows from financing activities      
Net increase (decrease) in short-term borrowings with original maturities of three months or less 67,992 (103,063) (15,909)
Proceeds from issuance of short-term debt 125,000 0 0
Repayment of short-term debt (75,000) 0 0
Proceeds from issuance of long-term debt 532,325 115,000 80,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds (465,000) (75,000) 0
Net proceeds from issuance of common stock 0 13,220 104,435
Common stock dividends (134,873) (117,274) (131,765)
Other (6,349) 2,197 2,427
Net cash used in financing activities 378,287 218,781 473,802
Net increase (decrease) in cash and equivalents (16,571) (22,026) 124,936
Cash and cash equivalents, January 1 278,452 300,478 175,542
Cash and cash equivalents, December 31 261,881 278,452 300,478
Hawaiian Electric Industries, Inc.      
Cash flows from operating activities      
Net cash provided by operating activities 99,600 191,710 98,119
Cash flows from investing activities      
Increase in note receivable from subsidiary (70,000) 0 0
Decrease in note receivable from subsidiary (66,391) 0 0
Capital expenditures (317) (212) (173)
Investments in subsidiaries (22,353) (24,000) 0
Other (177) 1 0
Net cash used in investing activities (26,456) (24,211) (173)
Cash flows from financing activities      
Net increase (decrease) in notes payable to subsidiaries with original maturities of three months or less 98 (618) 87
Net increase (decrease) in short-term borrowings with original maturities of three months or less 62,993 (103,063) (15,909)
Proceeds from issuance of short-term debt 125,000 0 0
Repayment of short-term debt (75,000) 0 0
Proceeds from issuance of long-term debt 150,000 75,000 0
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds (200,000) (75,000) 0
Withheld shares for employee taxes on vested share-based compensation (3,828) (2,416) (3,260)
Net proceeds from issuance of common stock 0 13,220 104,435
Common stock dividends (134,873) (117,274) (131,765)
Other (756) 2,460 3,306
Net cash used in financing activities (76,366) (207,691) (43,106)
Net increase (decrease) in cash and equivalents (3,222) (40,192) 54,840
Cash and cash equivalents, January 1 14,924 55,116 276
Cash and cash equivalents, December 31 11,702 14,924 55,116
Cash dividends received from subsidiaries $ 125,000 $ 130,000 $ 121,000