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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT- STATEMENT OF CASH FLOWS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities      
Net cash provided by operating activities $ 495,254,000 $ 355,880,000 $ 325,420,000
Cash flows from investing activities      
Capital expenditures (330,043,000) (363,804,000) (364,826,000)
Other 856,000 7,940,000 1,125,000
Net cash used in investing activities (736,465,000) (705,724,000) (592,449,000)
Cash flows from financing activities      
Net increase (decrease) in short-term borrowings with original maturities of three months or less (103,063,000) (15,909,000) 13,490,000
Proceeds from issuance of long-term debt 115,000,000 80,000,000 125,000,000
Repayment of long-term debt (75,000,000) 0 (111,400,000)
Excess tax benefits from share-based payment arrangements 404,000 978,000 277,000
Net proceeds from issuance of common stock 13,220,000 104,435,000 26,898,000
Common stock dividends (117,274,000) (131,765,000) (126,458,000)
Other (219,000) (833,000) (456,000)
Net cash used in financing activities 219,185,000 474,780,000 222,535,000
Net increase (decrease) in cash and equivalents (22,026,000) 124,936,000 (44,494,000)
Cash and cash equivalents, January 1 300,478,000 175,542,000 220,036,000
Cash and cash equivalents, December 31 278,452,000 300,478,000 175,542,000
Issuance of common stock: Dividend reinvestment and stock purchase plan 26,844,000   2,461,000
Common stock      
Cash flows from financing activities      
Issuance of common stock: Dividend reinvestment and stock purchase plan 26,844,000   2,461,000
Hawaiian Electric Industries, Inc.      
Cash flows from operating activities      
Net cash provided by operating activities 191,306,000 97,141,000 100,794,000
Cash flows from investing activities      
Capital expenditures (212,000) (173,000) (74,000)
Investments in subsidiaries (24,000,000) 0 (40,000,000)
Other 1,000 0 0
Net cash used in investing activities (24,211,000) (173,000) (40,074,000)
Cash flows from financing activities      
Net increase (decrease) in notes payable to subsidiaries with original maturities of three months or less (618,000) 87,000 (222,000)
Net increase (decrease) in short-term borrowings with original maturities of three months or less (103,063,000) (15,909,000) 13,490,000
Proceeds from issuance of long-term debt 75,000,000 0 125,000,000
Repayment of long-term debt (75,000,000) 0 (100,000,000)
Excess tax benefits from share-based payment arrangements 404,000 978,000 277,000
Net proceeds from issuance of common stock 13,220,000 104,435,000 26,898,000
Common stock dividends (117,274,000) (131,765,000) (126,458,000)
Other 44,000 46,000 0
Net cash used in financing activities (207,287,000) (42,128,000) (61,015,000)
Net increase (decrease) in cash and equivalents (40,192,000) 54,840,000 (295,000)
Cash and cash equivalents, January 1 55,116,000 276,000 571,000
Cash and cash equivalents, December 31 14,924,000 55,116,000 276,000
Cash dividends received from subsidiaries 130,000,000 121,000,000 124,000,000
Hawaiian Electric Industries, Inc. | Common stock      
Cash flows from financing activities      
Issuance of common stock: Dividend reinvestment and stock purchase plan 17,000,000 0 0
Hawaiian Electric Industries, Inc. | ASB Hawaii, Inc. | Consolidated subsidiary      
Cash flows from financing activities      
Accounts receivable reduction 2,300,000 2,300,000 2,400,000
HEI notes payable increase to ASHI $ 2,300,000 $ 300,000 $ 2,500,000