Consolidated Statements of Comprehensive Income (Parenthetical) - HECO - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement benefit plans:
Net gains (losses) arising during the period, taxes (benefits)	$ 53,068	$ (20,907)	$ 3,892
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits	6,665	8,247	3,512
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits	59,429	(13,825)	5,610
Hawaiian Electric Company, Inc. and Subsidiaries
Retirement benefit plans:
Net gains (losses) arising during the period, taxes (benefits)	52,554	(21,868)	1,821
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits	6,750	7,474	3,312
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits	$ (59,429)	$ 13,825	$ (5,610)