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Shareholders' equity
 9 Months Ended
Sep. 30, 2022
Equity [Abstract]  
Shareholders' equity Shareholders' equity
Accumulated other comprehensive income/(loss).  Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows:
HEI ConsolidatedHawaiian Electric Consolidated
 (in thousands) Net unrealized gains (losses) on securities Unrealized gains (losses) on derivativesRetirement benefit plansAOCIAOCI-Retirement benefit plans
Balance, December 31, 2021$(32,037)$(3,638)$(16,858)$(52,533)$(3,280)
Current period other comprehensive income (loss)(308,229)6,561 657 (301,011)210 
Balance, September 30, 2022$(340,266)$2,923 $(16,201)$(353,544)$(3,070)
Balance, December 31, 2020$19,986 $(3,363)$(17,887)$(1,264)$(2,919)
Current period other comprehensive income (loss)(40,308)1,009 450 (38,849)175 
Balance, September 30, 2021$(20,322)$(2,354)$(17,437)$(40,113)$(2,744)

Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCIAffected line item in the
 Statements of Income / Balance Sheets
Three months ended September 30Nine months ended September 30
(in thousands)2022202120222021
HEI consolidated
Net realized gains on securities included in net income$— $— $— $(387)Gain on sale of investment securities, net
Net realized losses on derivatives qualifying as cash flow hedges53 9 161 9 Interest expense
Retirement benefit plans:     
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost5,606 2,853 10,229 14,871 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets(5,303)(2,799)(9,572)(14,421)
See Note 9 for additional details
Total reclassifications$356 $63 $818 $72  
Hawaiian Electric consolidated
Retirement benefit plans:   
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost$5,411 $2,905 $9,782 $14,596 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets(5,303)(2,799)(9,572)(14,421)
See Note 9 for additional details
Total reclassifications$108 $106 $210 $175