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Bank subsidiary (HEI only) (Details 18) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Hawaiian Electric Industries, Inc. \| Consolidated subsidiary \| American Savings Bank (ASB) \| Management and administrative services
Revenue from related party	$ 2.3	$ 1.9	$ 1.4
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)
Cash dividends paid	$ 40	$ 45

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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