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Summary of significant accounting policies - Leases and Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Leases |  |  |  |
Operating lease expense | $ 21 | $ 20 | $ 19 |
Future minimum lease payments |  |  |  |
2019 | 11 |  |  |
2020 | 9 |  |  |
2021 | 8 |  |  |
2022 | 5 |  |  |
2023 | 4 |  |  |
Thereafter | 12 |  |  |
Total | 49 |  |  |
ASU 2016-02 | Scenario, Forecast |  |  |  |
Future minimum lease payments |  |  |  |
Operating lease, liability |  |  |  | $ 257
Operating lease, right-of-use asset |  |  |  | 257
ASU 2016-02 | Scenario, Forecast | PPAs |  |  |  |
Future minimum lease payments |  |  |  |
Operating lease, liability |  |  |  | 215
Operating lease, right-of-use asset |  |  |  | 215
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Leases |  |  |  |
Operating lease expense | 11 | $ 11 | $ 10 |
Future minimum lease payments |  |  |  |
2019 | 6 |  |  |
2020 | 6 |  |  |
2021 | 5 |  |  |
2022 | 2 |  |  |
2023 | 2 |  |  |
Thereafter | 3 |  |  |
Total | $ 24 |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | ASU 2016-02 | Scenario, Forecast |  |  |  |
Future minimum lease payments |  |  |  |
Operating lease, liability |  |  |  | 236
Operating lease, right-of-use asset |  |  |  | $ 236

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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