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Electric utility segment - Power purchase agreements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | $ 162 | $ 161 | $ 296 | $ 301
Hawaiian Electric (parent only) | Kalaeloa |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 61 | 52 | 101 | 92
Hawaiian Electric (parent only) | AES Hawaii |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 32 | 32 | 64 | 69
Hawaiian Electric (parent only) | HPOWER |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 19 | 17 | 37 | 32
Hawaiian Electric (parent only) | Puna Geothermal Venture |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 0 | 4 | 0 | 15
Hawaiian Electric (parent only) | Hamakua Energy |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 18 | 15 | 34 | 22
Hawaiian Electric (parent only) | Wind IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 23 | 31 | 43 | 53
Hawaiian Electric (parent only) | Solar IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 8 | 8 | 15 | 14
Hawaiian Electric (parent only) | Other IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | $ 1 | $ 2 | $ 2 | $ 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=115205541&loc=SL114868664-224227 + Details
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