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Income taxes (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective income tax, percent	19.00%	23.00%
Federal income tax rate	21.00%		35.00%
Hawaiian Electric Company, Inc. and Subsidiaries
Income Tax Contingency [Line Items]
Effective income tax, percent	21.00%	23.00%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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-Topic 740
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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