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Electric utility segment Cumulative Preferred Stock (Details) | Dec. 31, 2014 $ / shares
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HECO | Multiple Series Preferred Stock |
Class of Stock [Line Items] |
Preferred Stock Voluntary Liquidation Preference | $ 20
Preferred Stock, Redemption Price Per Share | 21
HECO | Series I Preferred Stock |
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 |
Class of Stock [Line Items] |
Preferred Stock Voluntary Liquidation Preference | 100
Preferred Stock, Redemption Price Per Share | 100
MECO | Series H Preferred Stock |
Class of Stock [Line Items] |
Preferred Stock Voluntary Liquidation Preference | 100
Preferred Stock, Redemption Price Per Share | $ 100

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