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Retirement benefits - Components of NPPC and NPBC (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension benefits |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | $ 78,173 | $ 81,432 | $ 73,387
Interest cost | 80,062 | 75,361 | 81,335
Expected return on plan assets | (141,266) | (132,223) | (113,800)
Amortization of net prior service (gain) cost | 0 | 0 | 8
Amortization of net actuarial losses | 27,412 | 27,245 | 33,456
Net periodic pension/benefit cost | 44,381 | 51,815 | 74,386
Impact of PUC D&Os | 37,148 | 27,963 | 20,997
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ 81,529 | 79,778 | 95,383
Actual net return on plan assets | (19.80%) |  |
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | $ 75,845 | 79,463 | 71,604
Interest cost | 74,363 | 70,235 | 75,484
Expected return on plan assets | (133,873) | (125,404) | (107,369)
Amortization of net prior service (gain) cost | 0 | 0 | 9
Amortization of net actuarial losses | 26,358 | 27,534 | 30,566
Net periodic pension/benefit cost | 42,693 | 51,828 | 70,294
Impact of PUC D&Os | 37,148 | 27,963 | 20,997
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ 79,841 | 79,791 | 91,291
Actual net return on plan assets | (19.80%) |  |
Other benefits |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | $ 2,580 | 2,827 | 2,537
Interest cost | 6,502 | 6,122 | 7,407
Expected return on plan assets | (13,621) | (12,957) | (12,124)
Amortization of net prior service (gain) cost | (928) | (1,533) | (1,761)
Amortization of net actuarial losses | (12) | 203 | 208
Net periodic pension/benefit cost | (5,479) | (5,338) | (3,733)
Impact of PUC D&Os | 4,966 | 4,839 | 3,179
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (513) | (499) | (554)
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 2,554 | 2,802 | 2,515
Interest cost | 6,227 | 5,875 | 7,103
Expected return on plan assets | (13,381) | (12,755) | (11,957)
Amortization of net prior service (gain) cost | (925) | (1,530) | (1,758)
Amortization of net actuarial losses | 0 | 206 | 207
Net periodic pension/benefit cost | (5,525) | (5,402) | (3,890)
Impact of PUC D&Os | 4,966 | 4,839 | 3,179
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ (559) | $ (563) | $ (711)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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