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Revenue taxes (Details) - HECO (Hawaiian Electric Company, Inc. and Subsidiaries, USD $) In Millions | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Revenue taxes |  |
Revenue taxes included in Operating revenues | $ 121 | $ 100
Revenue taxes included as expense in Taxes, other than income taxes | $ 121 | $ 100

X
- Definition Discloses the amount included as operating expenses for the period related to revenues taxes, which is included in Taxes, other than income taxes. + Details
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Namespace Prefix: | he
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Discloses the amount included in operating revenues for the period related to revenues taxes. + Details
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Namespace Prefix: | he
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
Name: | he_RevenueTaxesLineItems
Namespace Prefix: | he
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration