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Revenue taxes (Details) - HECO (Hawaiian Electric Company, Inc. and Subsidiaries, USD $)
In Millions, unless otherwise specified |
9 Months Ended | |
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Sep. 30, 2012
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Sep. 30, 2011
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Hawaiian Electric Company, Inc. and Subsidiaries
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| Revenue taxes | ||
| Revenue taxes included in Operating revenues | $ 212 | $ 193 |
| Revenue taxes included as expense in Taxes, other than income taxes | $ 212 | $ 193 |