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Electric utility segment - Condensed consolidating statement of cash flows (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Cash flows from operating activities      
Net cash provided by operating activities $ 117,587 $ 197,383  
Cash flows from investing activities      
Capital expenditures (148,414) (197,816)  
Other 7,805 4,469  
Net cash used in investing activities (771,432) (629,256)  
Cash flows from financing activities      
Common stock dividends (74,311) (72,037)  
Proceeds from issuance of short-term debt 0 165,000  
Repayment of short-term debt (65,000) (100,000)  
Proceeds from issuance of long-term debt 191,487 351,942  
Repayment of long-term debt and funds transferred for repayment of long-term debt (51,989) (177,245)  
Net increase (decrease) in other bank borrowings with original maturities of three months or less 39,995 (20,135)  
Other (2,037) (1,672)  
Net cash provided by financing activities 552,927 808,046  
Net increase (decrease) in cash, cash equivalents and restricted cash (100,918) 376,173  
Cash, cash equivalents and restricted cash, beginning of period 358,979 227,685  
Cash, cash equivalents and restricted cash, end of period 258,061 603,858  
Less: Restricted cash (10,618) (29,376) $ (17,558)
Cash and cash equivalents, end of period 247,443 574,482 341,421
Hawaiian Electric Consolidated      
Cash flows from operating activities      
Net cash provided by operating activities 57,453 181,468  
Cash flows from investing activities      
Capital expenditures (138,025) (186,532)  
Advances from affiliates 0 0  
Other 4,670 5,441  
Net cash used in investing activities (133,355) (181,091)  
Cash flows from financing activities      
Common stock dividends (55,850) (53,568)  
Preferred stock dividends of Hawaiian Electric and subsidiaries (998) (998)  
Proceeds from issuance of short-term debt 0 100,000  
Repayment of short-term debt (50,000) (100,000)  
Proceeds from issuance of long-term debt 115,000 255,000  
Repayment of long-term debt and funds transferred for repayment of long-term debt 0 (109,000)  
Net increase (decrease) in other bank borrowings with original maturities of three months or less 37,999 (38,987)  
Other (941) (1,347)  
Net cash provided by financing activities 45,210 51,100  
Net increase (decrease) in cash, cash equivalents and restricted cash (30,692) 51,477  
Cash, cash equivalents and restricted cash, beginning of period 63,326 41,894  
Cash, cash equivalents and restricted cash, end of period 32,634 93,371  
Less: Restricted cash (8,968) (29,376) (15,966)
Cash and cash equivalents, end of period 23,666 63,995 47,360
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric Industries, Inc.      
Cash flows from operating activities      
Net cash provided by operating activities 43,623 154,967  
Cash flows from investing activities      
Capital expenditures (92,352) (129,829)  
Advances from affiliates 22,900 14,200  
Other 3,087 4,354  
Net cash used in investing activities (66,365) (111,275)  
Cash flows from financing activities      
Common stock dividends (55,850) (53,568)  
Preferred stock dividends of Hawaiian Electric and subsidiaries (540) (540)  
Proceeds from issuance of short-term debt   100,000  
Repayment of short-term debt (50,000) (100,000)  
Proceeds from issuance of long-term debt 60,000 205,000  
Repayment of long-term debt and funds transferred for repayment of long-term debt   (95,000)  
Net increase (decrease) in other bank borrowings with original maturities of three months or less 37,999 (46,987)  
Other (703) (1,039)  
Net cash provided by financing activities (9,094) 7,866  
Net increase (decrease) in cash, cash equivalents and restricted cash (31,836) 51,558  
Cash, cash equivalents and restricted cash, beginning of period 58,171 32,988  
Cash, cash equivalents and restricted cash, end of period 26,335 84,546  
Less: Restricted cash (8,968) (29,376) (15,966)
Cash and cash equivalents, end of period 17,367 55,170 42,205
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light      
Cash flows from operating activities      
Net cash provided by operating activities 15,315 20,307  
Cash flows from investing activities      
Capital expenditures (22,135) (30,785)  
Advances from affiliates 0 8,000  
Other 911 552  
Net cash used in investing activities (21,224) (22,233)  
Cash flows from financing activities      
Common stock dividends (7,300) (8,160)  
Preferred stock dividends of Hawaiian Electric and subsidiaries (267) (267)  
Proceeds from issuance of short-term debt   0  
Repayment of short-term debt 0 0  
Proceeds from issuance of long-term debt 30,000 10,000  
Repayment of long-term debt and funds transferred for repayment of long-term debt   (14,000)  
Net increase (decrease) in other bank borrowings with original maturities of three months or less (15,700) 12,000  
Other (116) (61)  
Net cash provided by financing activities 6,617 (488)  
Net increase (decrease) in cash, cash equivalents and restricted cash 708 (2,414)  
Cash, cash equivalents and restricted cash, beginning of period 3,046 7,008  
Cash, cash equivalents and restricted cash, end of period 3,754 4,594  
Less: Restricted cash 0 0 0
Cash and cash equivalents, end of period 3,754 4,594 3,046
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric      
Cash flows from operating activities      
Net cash provided by operating activities 13,365 21,601  
Cash flows from investing activities      
Capital expenditures (23,538) (25,918)  
Advances from affiliates 0 0  
Other 672 480  
Net cash used in investing activities (22,866) (25,438)  
Cash flows from financing activities      
Common stock dividends (7,550) (7,192)  
Preferred stock dividends of Hawaiian Electric and subsidiaries (191) (191)  
Proceeds from issuance of short-term debt   0  
Repayment of short-term debt 0 0  
Proceeds from issuance of long-term debt 25,000 40,000  
Repayment of long-term debt and funds transferred for repayment of long-term debt   0  
Net increase (decrease) in other bank borrowings with original maturities of three months or less (7,200) (26,200)  
Other (122) (247)  
Net cash provided by financing activities 9,937 6,170  
Net increase (decrease) in cash, cash equivalents and restricted cash 436 2,333  
Cash, cash equivalents and restricted cash, beginning of period 2,032 1,797  
Cash, cash equivalents and restricted cash, end of period 2,468 4,130  
Less: Restricted cash 0 0 0
Cash and cash equivalents, end of period 2,468 4,130 2,032
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiaries      
Cash flows from operating activities      
Net cash provided by operating activities 0 0  
Cash flows from investing activities      
Capital expenditures 0 0  
Advances from affiliates 0 0  
Other 0 0  
Net cash used in investing activities 0 0  
Cash flows from financing activities      
Common stock dividends 0 0  
Preferred stock dividends of Hawaiian Electric and subsidiaries 0 0  
Proceeds from issuance of short-term debt   0  
Repayment of short-term debt 0 0  
Proceeds from issuance of long-term debt 0 0  
Repayment of long-term debt and funds transferred for repayment of long-term debt   0  
Net increase (decrease) in other bank borrowings with original maturities of three months or less 0 0  
Other 0 0  
Net cash provided by financing activities 0 0  
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0  
Cash, cash equivalents and restricted cash, beginning of period 77 101  
Cash, cash equivalents and restricted cash, end of period 77 101  
Less: Restricted cash 0 0 0
Cash and cash equivalents, end of period 77 101 77
Hawaiian Electric Consolidated | Consolidating adjustments      
Cash flows from operating activities      
Net cash provided by operating activities (14,850) (15,407)  
Cash flows from investing activities      
Capital expenditures 0 0  
Advances from affiliates (22,900) (22,200)  
Other 0 55  
Net cash used in investing activities (22,900) (22,145)  
Cash flows from financing activities      
Common stock dividends 14,850 15,352  
Preferred stock dividends of Hawaiian Electric and subsidiaries 0 0  
Proceeds from issuance of short-term debt   0  
Repayment of short-term debt 0 0  
Proceeds from issuance of long-term debt 0 0  
Repayment of long-term debt and funds transferred for repayment of long-term debt   0  
Net increase (decrease) in other bank borrowings with original maturities of three months or less 22,900 22,200  
Other 0 0  
Net cash provided by financing activities 37,750 37,552  
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0  
Cash, cash equivalents and restricted cash, beginning of period 0 0  
Cash, cash equivalents and restricted cash, end of period 0 0  
Less: Restricted cash 0 0 0
Cash and cash equivalents, end of period $ 0 $ 0 $ 0