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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT- STATEMENT OF CASH FLOWS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities      
Net cash provided by operating activities $ 355,880,000 $ 325,420,000 $ 361,568,000
Cash flows from investing activities      
Capital expenditures (363,804,000) (364,826,000) (389,438,000)
Net cash used in investing activities (705,724,000) (592,449,000) (598,182,000)
Cash flows from financing activities      
Net increase (decrease) in short-term borrowings with original maturities of three months or less (15,909,000) 13,490,000 21,789,000
Proceeds from issuance of long-term debt 80,000,000 125,000,000 286,000,000
Repayment of long-term debt 0 (111,400,000) (216,000,000)
Excess tax benefits from share-based payment arrangements 978,000 277,000 430,000
Net proceeds from issuance of common stock 104,435,000 26,898,000 55,086,000
Common stock dividends (131,765,000) (126,458,000) (98,383,000)
Other (833,000) (456,000) (1,187,000)
Net cash used in financing activities 474,780,000 222,535,000 236,988,000
Net increase (decrease) in cash and equivalents 124,936,000 (44,494,000) 374,000
Cash and cash equivalents, January 1 175,542,000 220,036,000 219,662,000
Cash and cash equivalents, December 31 300,478,000 175,542,000 220,036,000
Issuance of common stock: Dividend reinvestment and stock purchase plan   2,461,000 41,692,000
Common stock      
Cash flows from financing activities      
Issuance of common stock: Dividend reinvestment and stock purchase plan   2,461,000 41,692,000
Hawaiian Electric Industries, Inc.      
Cash flows from operating activities      
Net cash provided by operating activities 97,141,000 100,794,000 82,274,000
Cash flows from investing activities      
Capital expenditures (173,000) (74,000) (201,000)
Investments in subsidiaries 0 (40,000,000) (78,500,000)
Net cash used in investing activities (173,000) (40,074,000) (78,701,000)
Cash flows from financing activities      
Net increase (decrease) in notes payable to subsidiaries with original maturities of three months or less 87,000 (222,000) 56,000
Net increase (decrease) in short-term borrowings with original maturities of three months or less (15,909,000) 13,490,000 21,788,000
Proceeds from issuance of long-term debt 0 125,000,000 50,000,000
Repayment of long-term debt 0 (100,000,000) (50,000,000)
Excess tax benefits from share-based payment arrangements 978,000 277,000 430,000
Net proceeds from issuance of common stock 104,435,000 26,898,000 55,086,000
Common stock dividends (131,765,000) (126,458,000) (98,383,000)
Other 46,000 0 0
Net cash used in financing activities (42,128,000) (61,015,000) (21,023,000)
Net increase (decrease) in cash and equivalents 54,840,000 (295,000) (17,450,000)
Cash and cash equivalents, January 1 276,000 571,000 18,021,000
Cash and cash equivalents, December 31 55,116,000 276,000 571,000
Cash dividends received from subsidiaries 121,000,000 124,000,000 122,000,000
Hawaiian Electric Industries, Inc. | Common stock      
Cash flows from financing activities      
Issuance of common stock: Dividend reinvestment and stock purchase plan 0 0 24,000,000
Hawaiian Electric Industries, Inc. | ASB Hawaii, Inc. | Consolidated subsidiary      
Cash flows from financing activities      
Accounts receivable reduction 2,300,000 2,400,000 2,300,000
HEI notes payable increase to ASHI $ 300,000 $ 2,500,000 $ 2,500,000