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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Schedule of accumulated other comprehensive income | Changes in the balances of each component of AOCI were as follows:
| HEI Consolidated |  | Hawaiian Electric Consolidated
(in thousands) | Net unrealized gains (losses) on securities |  | Unrealized gains (losses) on derivatives |  | Retirement benefit plans |  | AOCI |  | AOCI-Retirement benefit plans
Balance, December 31, 2018 | $ | (24,423) |  |  | $ | (436) |  |  | $ | (25,751) |  |  | $ | (50,610) |  |  | $ | 99 |
Current period other comprehensive income (loss) and reclassifications, net of taxes | 26,904 |  |  | (1,177) |  |  | 4,844 |  |  | 30,571 |  |  | (1,378) |
Balance, December 31, 2019 | 2,481 |  |  | (1,613) |  |  | (20,907) |  |  | (20,039) |  |  | (1,279) |
Current period other comprehensive income (loss) and reclassifications, net of taxes | 17,505 |  |  | (1,750) |  |  | 3,020 |  |  | 18,775 |  |  | (1,640) |
Balance, December 31, 2020 | 19,986 |  |  | (3,363) |  |  | (17,887) |  |  | (1,264) |  |  | (2,919) |
Current period other comprehensive income (loss) and reclassifications, net of taxes | (52,023) |  |  | (275) |  |  | 1,029 |  |  | (51,269) |  |  | (361) |
Balance, December 31, 2021 | $ | (32,037) |  |  | $ | (3,638) |  |  | $ | (16,858) |  |  | $ | (52,533) |  |  | $ | (3,280) |
Schedule of reclassifications out of AOCI | Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  | Affected line item in the Statement of Income/Balance Sheet
Years ended December 31 |  | 2021 |  | 2020 |  | 2019 |
(in thousands) |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |
Net realized gains on securities included in net income |  | $ | (387) |  |  | $ | (1,638) |  |  | $ | (478) |  |  | Gain on sale of investment securities, net
Net realized losses on derivatives qualifying as cash flow hedges |  | 37 |  |  | — |  |  | — |  |  | Interest expense
Retirement benefit plans: |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 19,253 |  |  | 23,689 |  |  | 10,107 |  |  | See Note 10 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (171,345) |  |  | 39,860 |  |  | (16,177) |  |  | See Note 10 for additional details
Total reclassifications |  | $ | (152,442) |  |  | $ | 61,911 |  |  | $ | (6,548) |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | $ | 19,461 |  |  | $ | 21,550 |  |  | $ | 9,550 |  |  | See Note 10 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (171,345) |  |  | 39,860 |  |  | (16,177) |  |  | See Note 10 for additional details
Total reclassifications |  | $ | (151,884) |  |  | $ | 61,410 |  |  | $ | (6,627) |  |  |

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