XML 35 R104.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Major customers - HECO (Hawaiian Electric Company and Subsidiaries) | 12 Months Ended
--- | ---
Dec. 31, 2011
Hawaiian Electric Company and Subsidiaries |
Major customers |
9. Major customers HECO and its subsidiaries received approximately 11% ($316 million), 10% ($242 million) and 10% ($199 million) of their operating revenues from the sale of electricity to various federal government agencies in 2011, 2010 and 2009, respectively.

X
- Definition This element represents entire disclosure on the major customers of reporting entity. + References No definition available. + Details
Name: | he_MajorCustomersDisclosureTextBlock
Namespace Prefix: | he_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration