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Electric utility segment Consolidating Statements of Changes in Common Stock Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Beginning Balance       $ 1,790,573       $ 1,726,406 $ 1,790,573 $ 1,726,406 $ 1,593,008
Net income (loss) for common stock $ 42,320 $ 50,673 $ 35,018 31,866 $ 33,253 $ 47,808 $ 41,281 45,787 159,877 168,129 161,709
Other comprehensive income (loss), net of tax benefits                 1,116 (10,628) 9,673
Issuance of common stock, net of expenses                   2,461 41,692
Common stock dividends                 (131,765) (126,505) (122,626)
Ending Balance 1,927,640       1,790,573       1,927,640 1,790,573 1,726,406
HECO                      
Beginning Balance       1,682,144       1,593,564 1,682,144 1,593,564 1,472,136
Net income (loss) for common stock                 135,714 137,641 122,929
Other comprehensive income (loss), net of tax benefits                 880 (563) 1,578
Issuance of common stock, net of expenses                 (8) 39,994 78,499
Common stock dividends                 (90,405) (88,492) (81,578)
Ending Balance 1,728,325       1,682,144       1,728,325 1,682,144 1,593,564
HELCO                      
Beginning Balance       281,846       274,802 281,846 274,802 268,908
Net income (loss) for common stock                 20,755 18,689 20,136
Other comprehensive income (loss), net of tax benefits                 122 (18) 145
Issuance of common stock, net of expenses                     0
Common stock dividends                 (10,021) (11,627) (14,387)
Ending Balance 292,702       281,846       292,702 281,846 274,802
MECO                      
Beginning Balance       256,692       248,771 256,692 248,771 228,927
Net income (loss) for common stock                 22,165 22,275 21,277
Other comprehensive income (loss), net of tax benefits                 44 (5) 123
Issuance of common stock, net of expenses                 (1) 0 12,461
Common stock dividends                 (15,175) (14,349) (14,017)
Ending Balance 263,725       256,692       263,725 256,692 248,771
Other subsidiaries                      
Beginning Balance       101       101 101 101 104
Net income (loss) for common stock                 0 0 (3)
Other comprehensive income (loss), net of tax benefits                     0
Issuance of common stock, net of expenses                     0
Ending Balance 101       101       101 101 101
Consolidating adjustments                      
Beginning Balance       (538,639)       (523,674) (538,639) (523,674) (497,939)
Net income (loss) for common stock                 (42,920) (40,964) (41,410)
Other comprehensive income (loss), net of tax benefits                 (166) 23 (268)
Issuance of common stock, net of expenses                 1 0 (12,461)
Common stock dividends                 25,196 25,976 28,404
Ending Balance (556,528)       (538,639)       (556,528) (538,639) (523,674)
HECO Consolidated                      
Beginning Balance       1,682,144       1,593,564 1,682,144 1,593,564 1,472,136
Net income (loss) for common stock 32,993 $ 43,006 $ 32,841 $ 26,874 29,112 $ 38,879 $ 34,230 $ 35,420 135,714 137,641 122,929
Other comprehensive income (loss), net of tax benefits                 880 (563) 1,578
Issuance of common stock, net of expenses                 (8) 39,994 78,499
Common stock dividends                 (90,405) (88,492) (81,578)
Ending Balance $ 1,728,325       $ 1,682,144       $ 1,728,325 $ 1,682,144 $ 1,593,564