Leases - Amounts Related to Lease Cost and Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Lease Cost [Abstract]
Operating lease cost	$ 66,971	$ 80,254
Variable lease cost	250,130	271,832
Sublease income	(2,675)	(2,515)
Total lease cost	314,426	349,571
Finance lease costs:
Amortization of right-of-use assets	1,196
Interest on lease liabilities	806
Total finance lease cost	2,002
Cash paid for amounts included in the measurement of lease liabilities:
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	59,193	$ 73,375
Operating cash flows from financing leases	806
Financing cash flows from financing leases	$ 849
Weighted-average remaining lease term (in years):
Operating leases	7 years 8 months 12 days	6 years 1 month 6 days
Finance leases	19 years 2 months 12 days
Weighted-average discount rate:
Operating leases	3.04%	3.18%
Finance leases	3.92%
Other leases
Operating Lease Cost [Abstract]
Operating lease cost	$ 20,811	$ 14,184
Variable lease cost	8,931	14,360
Sublease income	(2,675)	(2,515)
Total lease cost	27,067	26,029
Finance lease costs:
Amortization of right-of-use assets	188
Interest on lease liabilities	20
Total finance lease cost	208
Cash paid for amounts included in the measurement of lease liabilities:
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	19,143	$ 11,239
Operating cash flows from financing leases	20
Financing cash flows from financing leases	$ 179
Weighted-average remaining lease term (in years):
Operating leases	8 years 1 month 6 days	9 years 1 month 6 days
Finance leases	2 years 4 months 24 days
Weighted-average discount rate:
Operating leases	2.96%	2.84%
Finance leases	3.77%
PPAs classified as leases
Operating Lease Cost [Abstract]
Operating lease cost	$ 46,160	$ 66,070
Variable lease cost	241,199	257,472
Sublease income	0	0
Total lease cost	287,359	323,542
Finance lease costs:
Amortization of right-of-use assets	1,008
Interest on lease liabilities	786
Total finance lease cost	1,794
Cash paid for amounts included in the measurement of lease liabilities:
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	40,050	$ 62,136
Operating cash flows from financing leases	786
Financing cash flows from financing leases	$ 670
Weighted-average remaining lease term (in years):
Operating leases	5 years	2 years 6 months
Finance leases	19 years 7 months 6 days
Weighted-average discount rate:
Operating leases	3.50%	3.63%
Finance leases	3.92%
Hawaiian Electric Company, Inc. and Subsidiaries
Operating Lease Cost [Abstract]
Operating lease cost	$ 61,190	$ 74,648
Variable lease cost	247,351	269,058
Sublease income	(2,675)	(2,515)
Total lease cost	305,866	341,191
Finance lease costs:
Amortization of right-of-use assets	1,008
Interest on lease liabilities	786
Total finance lease cost	1,794
Cash paid for amounts included in the measurement of lease liabilities:
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	54,118	68,304
Operating cash flows from financing leases	786
Financing cash flows from financing leases	$ 670	$ 0	$ 0
Weighted-average remaining lease term (in years):
Operating leases	6 years 9 months 18 days	5 years 10 months 24 days
Finance leases	19 years 7 months 6 days
Weighted-average discount rate:
Operating leases	3.05%	3.31%
Finance leases	3.92%
Hawaiian Electric Company, Inc. and Subsidiaries | Other leases
Operating Lease Cost [Abstract]
Operating lease cost	$ 15,030	$ 8,578
Variable lease cost	6,152	11,586
Sublease income	(2,675)	(2,515)
Total lease cost	18,507	17,649
Finance lease costs:
Amortization of right-of-use assets	0
Interest on lease liabilities	0
Total finance lease cost	0
Cash paid for amounts included in the measurement of lease liabilities:
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	14,068	$ 6,168
Operating cash flows from financing leases	0
Financing cash flows from financing leases	$ 0
Weighted-average remaining lease term (in years):
Operating leases	7 years 3 months 18 days	10 years
Finance leases	0 years
Weighted-average discount rate:
Operating leases	2.94%	2.98%
Finance leases	0.00%
Hawaiian Electric Company, Inc. and Subsidiaries | PPAs classified as leases
Operating Lease Cost [Abstract]
Operating lease cost	$ 46,160	$ 66,070
Variable lease cost	241,199	257,472
Sublease income	0	0
Total lease cost	287,359	323,542
Finance lease costs:
Amortization of right-of-use assets	1,008
Interest on lease liabilities	786
Total finance lease cost	1,794
Cash paid for amounts included in the measurement of lease liabilities:
Cash paid for amounts included in the measurement of lease liabilities—Operating cash flows from operating leases	40,050	$ 62,136
Operating cash flows from financing leases	786
Financing cash flows from financing leases	$ 670
Weighted-average remaining lease term (in years):
Operating leases	5 years	2 years 6 months
Finance leases	19 years 7 months 6 days
Weighted-average discount rate:
Operating leases	3.50%	3.63%
Finance leases	3.92%