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Electric utility segment - Power Purchase Agreements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | $ 639 | $ 587 | $ 563
Kalaeloa Partners, L.P. (Kalaeloa) |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | 216 | 180 | 152
AES Hawaii, Inc. (AES Hawaii) |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | 140 | 140 | 149
HPOWER |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | 69 | 67 | 71
Puna Geothermal Venture |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | 15 | 38 | 28
Hamakua Energy Partners, L.P. (HEP) |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | 56 | 35 | 29
Hawaiian Commercial & Sugar (HC&S) |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | 0 | 0 | 1
Wind IPPs |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | 107 | 97 | 113
Solar IPPs |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | 29 | 27 | 15
Other IPPs |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |
Purchased power | $ 7 | $ 3 | $ 5

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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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