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Electric utility segment - Cumulative Preferred Stock (Details) | Dec. 31, 2021 $ / shares
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Series C, D, E, H, J and K Preferred Stock | Hawaiian Electric |
Class of Stock [Line Items] |
Voluntary liquidation price (in dollars per share) | $ 20
Redemption price (in dollars per share) | 21
Series I Preferred Stock | Hawaiian Electric |
Class of Stock [Line Items] |
Voluntary liquidation price (in dollars per share) | 20
Redemption price (in dollars per share) | 20
Series G Preferred Stock | Hawaii Electric Light Company, Inc. (HELCO) |
Class of Stock [Line Items] |
Voluntary liquidation price (in dollars per share) | 100
Redemption price (in dollars per share) | 100
Series H Preferred Stock | Maui Electric Company, Limited (MECO) |
Class of Stock [Line Items] |
Voluntary liquidation price (in dollars per share) | 100
Redemption price (in dollars per share) | $ 100

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