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Leases - Amounts Related to Lease Cost and Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating Lease Cost [Abstract]    
Operating lease cost $ 25,953 $ 66,971
Variable lease cost 211,047 250,130
Sublease income (3,031) (2,675)
Total operating lease cost 233,969 314,426
Finance lease costs:    
Amortization of right-of-use assets 5,981 1,196
Interest on lease liabilities 6,382 806
Total finance lease cost 12,363 2,002
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 27,147 59,193
Operating cash flows from financing leases 6,382 806
Financing cash flows from financing leases $ 3,519 $ 849
Weighted-average remaining lease term (in years):    
Operating leases 7 years 4 months 24 days 7 years 8 months 12 days
Finance leases 20 years 19 years 2 months 12 days
Weighted-average discount rate:    
Operating leases 3.11% 3.04%
Finance leases 8.18% 3.92%
Other leases    
Operating Lease Cost [Abstract]    
Operating lease cost $ 21,882 $ 20,811
Variable lease cost 8,491 8,931
Sublease income (3,031) (2,675)
Total operating lease cost 27,342 27,067
Finance lease costs:    
Amortization of right-of-use assets 390 188
Interest on lease liabilities 32 20
Total finance lease cost 422 208
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 23,076 19,143
Operating cash flows from financing leases 32 20
Financing cash flows from financing leases $ 391 $ 179
Weighted-average remaining lease term (in years):    
Operating leases 7 years 10 months 24 days 8 years 1 month 6 days
Finance leases 1 year 6 months 2 years 4 months 24 days
Weighted-average discount rate:    
Operating leases 3.04% 2.96%
Finance leases 3.77% 3.77%
PPAs classified as leases    
Operating Lease Cost [Abstract]    
Operating lease cost $ 4,071 $ 46,160
Variable lease cost 202,556 241,199
Sublease income 0 0
Total operating lease cost 206,627 287,359
Finance lease costs:    
Amortization of right-of-use assets 5,591 1,008
Interest on lease liabilities 6,350 786
Total finance lease cost 11,941 1,794
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 4,071 40,050
Operating cash flows from financing leases 6,350 786
Financing cash flows from financing leases $ 3,128 $ 670
Weighted-average remaining lease term (in years):    
Operating leases 4 years 5 years
Finance leases 20 years 1 month 6 days 19 years 7 months 6 days
Weighted-average discount rate:    
Operating leases 3.50% 3.50%
Finance leases 8.18% 3.92%
Hawaiian Electric Company, Inc. and Subsidiaries    
Operating Lease Cost [Abstract]    
Operating lease cost $ 20,018 $ 61,190
Variable lease cost 208,161 247,351
Sublease income (3,031) (2,675)
Total operating lease cost 225,148 305,866
Finance lease costs:    
Amortization of right-of-use assets 5,591 1,008
Interest on lease liabilities 6,350 786
Total finance lease cost 11,941 1,794
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 21,800 54,118
Operating cash flows from financing leases 6,350 786
Financing cash flows from financing leases $ 3,128 $ 670
Weighted-average remaining lease term (in years):    
Operating leases 6 years 3 months 18 days 6 years 9 months 18 days
Finance leases 20 years 1 month 6 days 19 years 7 months 6 days
Weighted-average discount rate:    
Operating leases 3.03% 3.05%
Finance leases 8.18% 3.92%
Hawaiian Electric Company, Inc. and Subsidiaries | Other leases    
Operating Lease Cost [Abstract]    
Operating lease cost $ 15,947 $ 15,030
Variable lease cost 5,605 6,152
Sublease income (3,031) (2,675)
Total operating lease cost 18,521 18,507
Finance lease costs:    
Amortization of right-of-use assets 0 0
Interest on lease liabilities 0 0
Total finance lease cost 0 0
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 17,729 14,068
Operating cash flows from financing leases 0 0
Financing cash flows from financing leases $ 0 $ 0
Weighted-average remaining lease term (in years):    
Operating leases 6 years 9 months 18 days 7 years 3 months 18 days
Finance leases 0 years 0 years
Weighted-average discount rate:    
Operating leases 2.92% 2.94%
Finance leases 0.00% 0.00%
Hawaiian Electric Company, Inc. and Subsidiaries | PPAs classified as leases    
Operating Lease Cost [Abstract]    
Operating lease cost $ 4,071 $ 46,160
Variable lease cost 202,556 241,199
Sublease income 0 0
Total operating lease cost 206,627 287,359
Finance lease costs:    
Amortization of right-of-use assets 5,591 1,008
Interest on lease liabilities 6,350 786
Total finance lease cost 11,941 1,794
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 4,071 40,050
Operating cash flows from financing leases 6,350 786
Financing cash flows from financing leases $ 3,128 $ 670
Weighted-average remaining lease term (in years):    
Operating leases 4 years 5 years
Finance leases 20 years 1 month 6 days 19 years 7 months 6 days
Weighted-average discount rate:    
Operating leases 3.50% 3.50%
Finance leases 8.18% 3.92%