Leases - Amounts Related to Lease Cost and Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 80,254	$ 74,520
Variable lease cost	271,832	229,938
Sublease income	(2,515)
Total lease cost	349,571	304,458
Other information
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	$ 73,375	$ 71,584
Weighted-average remaining lease term—operating leases (in years)	6 years 1 month 6 days	4 years 4 months 24 days
Weighted-average discount rate—operating leases	3.18%	3.61%
Other leases
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 14,184	$ 11,201
Variable lease cost	14,360	12,765
Sublease income	(2,515)
Total lease cost	26,029	23,966
Other information
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	$ 11,239	$ 10,783
Weighted-average remaining lease term—operating leases (in years)	9 years 1 month 6 days	8 years 10 months 24 days
Weighted-average discount rate—operating leases	2.84%	2.87%
PPAs classified as leases
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 66,070	$ 63,319
Variable lease cost	257,472	217,173
Sublease income	0
Total lease cost	323,542	280,492
Other information
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	$ 62,136	$ 60,801
Weighted-average remaining lease term—operating leases (in years)	2 years 6 months	1 year 9 months 18 days
Weighted-average discount rate—operating leases	3.63%	4.08%
Hawaiian Electric Company, Inc. and Subsidiaries
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 74,648	$ 69,341
Variable lease cost	269,058	227,015
Sublease income	(2,515)
Total lease cost	341,191	296,356
Other information
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	$ 68,304	$ 67,024
Weighted-average remaining lease term—operating leases (in years)	5 years 10 months 24 days	3 years 9 months 18 days
Weighted-average discount rate—operating leases	3.31%	3.84%
Hawaiian Electric Company, Inc. and Subsidiaries | Other leases
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 8,578	$ 6,022
Variable lease cost	11,586	9,842
Sublease income	(2,515)
Total lease cost	17,649	15,864
Other information
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	$ 6,168	$ 6,223
Weighted-average remaining lease term—operating leases (in years)	10 years	10 years 1 month 6 days
Weighted-average discount rate—operating leases	2.98%	3.20%
Hawaiian Electric Company, Inc. and Subsidiaries | PPAs classified as leases
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 66,070	$ 63,319
Variable lease cost	257,472	217,173
Sublease income	0
Total lease cost	323,542	280,492
Other information
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	$ 62,136	$ 60,801
Weighted-average remaining lease term—operating leases (in years)	2 years 6 months	1 year 9 months 18 days
Weighted-average discount rate—operating leases	3.63%	4.08%