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Electric utility segment - Power purchase agreements (Details) - Hawaiian Electric (parent only) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | $ 149 | $ 176 | $ 426 | $ 472
Kalaeloa |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 39 | 58 | 111 | 159
AES Hawaii |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 33 | 38 | 96 | 102
HPOWER |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 18 | 20 | 52 | 57
Hamakua Energy |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 12 | 17 | 36 | 51
Wind IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 30 | 30 | 83 | 73
Solar IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 17 | 11 | 45 | 26
Other IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | $ 0 | $ 2 | $ 3 | $ 4

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- Definition Amount of operating expense for purchased power of regulated operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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