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Electric utility segment - Power purchase agreements (Details) - Hawaiian Electric (parent only) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | $ 137 | $ 162 | $ 277 | $ 296
Kalaeloa |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 34 | 61 | 72 | 101
AES Hawaii |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 32 | 32 | 63 | 64
HPOWER |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 17 | 19 | 34 | 37
Hamakua Energy |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 11 | 18 | 24 | 34
Wind IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 25 | 23 | 53 | 43
Solar IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 17 | 8 | 28 | 15
Other IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | $ 1 | $ 1 | $ 3 | $ 2

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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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