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Electric utility segment (Details 5) (Hawaiian Electric Industries, Inc., HECO, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Hawaiian Electric Industries, Inc. | HECO |  |  |
Related Party Transaction [Line Items] |  |  |
Amount charged to subsidiaries for general management and administrative services | $ 6.2 | $ 6.1 | $ 4.9
Effective interest rate basis term | 30 days |  |
Line of credit facility basis point spread (as a percent) | 0.15% |  |

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