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Recent accounting pronouncements and interpretations (Details) | 6 Months Ended
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Jun. 30, 2011
Recent accounting pronouncements and interpretations |
Number of separate statements in which the entity plans to present comprehensive income | 2

X
- Definition Represents the number of statements in which the entity plans to present all items of net income and other comprehensive income. + Details
Name: | he_NewAccountingPronouncementOrChangeInAccountingPrincipleNumberOfSeparateStatements
Namespace Prefix: | he
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | he_RecentAccountingPronouncementsAndInterpretationsDisclosureAbstract
Namespace Prefix: | he
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration