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Long-term debt - Schedule of Long-Term Debt and Maturities (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Less unamortized debt issuance costs | $ (3,164,000) | $ (2,249,000)
Long-term debt, net—other than bank | 2,321,937,000 | 2,119,129,000
Aggregate principal payments, fiscal year maturity: |  |
2022 | 223,000,000 |
2023 | 163,000,000 |
2024 | 6,000,000 |
2025 | 104,000,000 |
2026 | 131,000,000 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | 1,684,000,000 | 1,569,000,000
Aggregate principal payments, fiscal year maturity: |  |
2022 | 52,000,000 |
2023 | 100,000,000 |
2024 | 0 |
2025 | 47,000,000 |
2026 | 125,000,000 |
Special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Debt Instrument [Line Items] |  |
Long-term debt, net—other than bank | 1,676,402,000 | 1,561,302,000
Senior notes | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | 1,142,000,000 | 1,027,000,000
Senior notes | HEI 5.67% senior notes, due 2021 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 0 | 50,000,000
Debt instrument, stated interest rate | 5.67% |
Senior notes | HEI 3.99% senior notes, due 2023 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 50,000,000 | 50,000,000
Debt instrument, stated interest rate | 3.99% |
Senior notes | HEI 4.58% senior notes, due 2025 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 50,000,000 | 50,000,000
Debt instrument, stated interest rate | 4.58% |
Senior notes | HEI 4.72% senior notes, due 2028 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 100,000,000 | 100,000,000
Debt instrument, stated interest rate | 4.72% |
Senior notes | HEI 2.82% senior notes, due 2028 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 24,000,000 | 0
Debt instrument, stated interest rate | 2.82% |
Senior notes | HEI 2.98% senior notes, due 2030 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 50,000,000 | 50,000,000
Debt instrument, stated interest rate | 2.98% |
Senior notes | HEI 3.15% senior notes, due 2031 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 51,000,000 | 0
Debt instrument, stated interest rate | 3.15% |
Senior notes | HEI 2.48% senior notes, due 2028 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 30,000,000 | 0
Debt instrument, stated interest rate | 2.48% |
Senior notes | HEI 2.78% senior notes, due 2031 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 25,000,000 | 0
Debt instrument, stated interest rate | 2.78% |
Senior notes | HEI 3.74% senior notes, due 2051 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 20,000,000 | 0
Debt instrument, stated interest rate | 3.74% |
Senior notes | Hāmākua Energy 4.02% non-recourse notes, due 2030 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 52,166,000 | 56,030,000
Debt instrument, stated interest rate | 4.02% |
Term Loan | HEI 2.99% term loan, due 2022 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 150,000,000 | 150,000,000
Debt instrument, stated interest rate | 2.99% |
Term Loan | Mauō 4.90% non-recourse loan, due 2034 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 12,686,000 | 0
Debt instrument, stated interest rate | 4.90% |
Term Loan | Ka`ie`ie Waho 2.79% non-recourse loan, due 2031 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 12,145,000 | 13,000,000
Debt instrument, stated interest rate | 2.79% |
Unsecured Debt | Mauo LIBOR + 1.375% loan, due 2023 |  |
Debt Instrument [Line Items] |  |
Gross long-term debt | $ 21,702,000 | $ 41,046,000
Maximum aggregate principal amount | 50,500,000 |
Paydown of loan balance, maximum balance | $ 7,000,000 |
Unsecured Debt | Mauo LIBOR + 1.375% loan, due 2023 | LIBOR |  |
Debt Instrument [Line Items] |  |
Line of credit facility basis point spread | 1.375% |

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