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Electric utility subsidiary - Taxes (Details) (Hawaiian Electric Company, Inc. and Subsidiaries, USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Revenue taxes |  |
Revenue taxes included in Operating revenues | $ 65 | $ 64
Revenue taxes included as expense in Taxes, other than income taxes | $ 65 | $ 64

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