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Electric utility segment - Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Revenue taxes
Expected increase in income tax depreciation expense			$ 126		$ 123
Hawaiian Electric Company, Inc. and Subsidiaries
Revenue taxes
Revenue taxes included in operating revenues and in taxes other than income taxes expense	$ 51	$ 58	$ 138	$ 159

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- Definition

Represents the utility revenue taxes included in operating revenues and in taxes, other than income taxes expense.

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- Definition

Income Tax Expense, Expected Increase In Depreciation Expense, Amount

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- Definition

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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