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Bank segment (HEI only) Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Hawaiian Electric Industries, Inc. | Consolidated subsidiary | American Savings Bank (ASB) | Management and administrative services |  |  |
Revenue from related party | $ 2.3 | $ 2.3 | $ 1.9
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) |  |  |
Borrowing capacity | 1,200.0 | 1,100.0 |
Cash dividends paid | $ 36.0 | $ 40.0 |

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