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Retirement benefits - Components of NPPC and NPBC (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension benefits |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | $ 81,432 | $ 73,387 | $ 62,135
Interest cost | 75,361 | 81,335 | 84,267
Expected return on plan assets | (132,223) | (113,800) | (111,989)
Amortization of net prior service (gain) cost | 0 | 8 | (42)
Amortization of net actuarial losses | 27,245 | 33,456 | 15,479
Net periodic pension/benefit cost | 51,815 | 74,386 | 49,850
Impact of PUC D&Os | 27,963 | 20,997 | 48,143
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 79,778 | 95,383 | 97,993
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 79,463 | 71,604 | 60,461
Interest cost | 70,235 | 75,484 | 77,851
Expected return on plan assets | (125,404) | (107,369) | (104,632)
Amortization of net prior service (gain) cost | 0 | 9 | 7
Amortization of net actuarial losses | 27,534 | 30,566 | 14,658
Net periodic pension/benefit cost | 51,828 | 70,294 | 48,345
Impact of PUC D&Os | 27,963 | 20,997 | 48,143
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 79,791 | 91,291 | 96,488
Other benefits |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 2,827 | 2,537 | 2,209
Interest cost | 6,122 | 7,407 | 8,004
Expected return on plan assets | (12,957) | (12,124) | (12,356)
Amortization of net prior service (gain) cost | (1,533) | (1,761) | (1,806)
Amortization of net actuarial losses | 203 | 208 | (13)
Net periodic pension/benefit cost | (5,338) | (3,733) | (3,962)
Impact of PUC D&Os | 4,839 | 3,179 | 3,258
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (499) | (554) | (704)
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 2,802 | 2,515 | 2,191
Interest cost | 5,875 | 7,103 | 7,673
Expected return on plan assets | (12,755) | (11,957) | (12,180)
Amortization of net prior service (gain) cost | (1,530) | (1,758) | (1,803)
Amortization of net actuarial losses | 206 | 207 | 0
Net periodic pension/benefit cost | (5,402) | (3,890) | (4,119)
Impact of PUC D&Os | 4,839 | 3,179 | 3,258
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ (563) | $ (711) | $ (861)

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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 http://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 http://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 http://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 http://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 http://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 http://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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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