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Bank subsidiary (Details 17) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Hawaiian Electric Industries, Inc. \| Maximum
Obligation to contribute additional capital under the Capital Maintenance Agreement	$ 65.1
Reduction in obligation to contribute additional capital under the Capital Maintenance Agreement	28.3
American Savings Bank (ASB)
Dividends paid	58	62
Noncash dividends paid	$ 5

Equity impact of paid-in-kind dividends declared by an entity during the period for all classes of stock (common, preferred, etc.). This element includes paid and unpaid dividends declared during the period.

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