Consolidated Statements of Comprehensive Income (Parenthetical) - HECO - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Foreign currency hedge net unrealized loss, tax benefits	$ (179)	$ 0	$ 0
Reclassification adjustment to net income, tax expense	76	(150)	(150)
Net gains (losses) arising during the period, tax benefits	27,703	(3,753)	149,364
Amortization of transition obligation, prior service credit and net losses recognized during the period, tax benefits	9,267	14,344	7,245
Reclassification adjustment for impact of D&Os of the PUC (expense) benefits	18,206	(16,011)	132,373
Hawaiian Electric Company, Inc. and Subsidiaries
Foreign currency hedge net unrealized loss, tax benefits	(179)	0	0
Reclassification adjustment to net income, tax expense	110	0	0
Retirement benefit plans (expense) benefits	0	0	0
Net gains (losses) arising during the period, tax benefits	27,153	(3,590)	139,236
Amortization of transition obligation, prior service credit and net losses recognized during the period, tax benefits	8,442	12,981	6,504
Reclassification adjustment for impact of D&Os of the PUC (expense) benefits	$ (18,206)	$ 16,011	$ (132,373)