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Taxes (Details) - HECO (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries
Revenue taxes |  |  |
Revenue taxes included in Operating revenues |  | $ 198 | $ 212
Revenue taxes included as expense in Taxes, other than income taxes |  | 198 | 212
Out-of-period tax benefit related to utilities | $ 2.7 |  |

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