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Electric utility segment (Details 4) (USD $)	Dec. 31, 2013
HECO \| Multiple Series Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock Voluntary Liquidation Preference	$ 20
Preferred Stock, Redemption Price Per Share	$ 21
HECO \| Series I Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock Voluntary Liquidation Preference	$ 20
Preferred Stock, Redemption Price Per Share	$ 20
Hawaii Electric Light Company, Inc. (HELCO) \| Series G Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock Voluntary Liquidation Preference	$ 100
Preferred Stock, Redemption Price Per Share	$ 100
MECO \| Series H Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock Voluntary Liquidation Preference	$ 100
Preferred Stock, Redemption Price Per Share	$ 100

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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