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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Less unamortized debt issuance costs | $ (3,164) | $ (2,249) |
Long-term debt, net—other than bank | 2,321,937 | 2,119,129 |
Aggregate principal payments, fiscal year maturity: |  |  |
2022 | 223,000 |  |
2023 | 163,000 |  |
2024 | 6,000 |  |
2025 | 104,000 |  |
2026 | 131,000 |  |
Hawaiian Electric (parent only) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Less unamortized debt issuance costs | (1,520) | (855) |
Long-term debt, net—other than bank | 548,480 | 449,145 |
Aggregate principal payments, fiscal year maturity: |  |  |
2022 | 150,000 |  |
2023 | 50,000 |  |
2024 | 0 |  |
2025 | 50,000 |  |
2026 | 0 |  |
Thereafter | 300,000 |  |
Cash dividends paid | 172,000 | 145,000 | $ 157,000
Hawaiian Electric (parent only) | ASB Hawaii, Inc. | Consolidated subsidiary |  |  |
Aggregate principal payments, fiscal year maturity: |  |  |
Accounts receivable reduction | 2,100 | 2,300 | 2,300
HEI notes payable increase to ASHI | 2,100 | 2,300 | $ 2,300
Hawaiian Electric (parent only) | HEI loan 2.99%, due 2022 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 150,000 | 150,000 |
Debt instrument, stated interest rate | 2.99% |  |
Hawaiian Electric (parent only) | HEI 5.67% senior notes, due 2021 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 0 | 50,000 |
Debt instrument, stated interest rate | 5.67% |  |
Hawaiian Electric (parent only) | HEI 3.99% senior notes, due 2023 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 50,000 | 50,000 |
Debt instrument, stated interest rate | 3.99% |  |
Hawaiian Electric (parent only) | HEI 4.58% senior notes, due 2025 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 50,000 | 50,000 |
Debt instrument, stated interest rate | 4.58% |  |
Hawaiian Electric (parent only) | HEI 4.72% senior notes, due 2028 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 100,000 | 100,000 |
Debt instrument, stated interest rate | 4.72% |  |
Hawaiian Electric (parent only) | HEI 2.82% senior notes, due 2028 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 24,000 | 0 |
Debt instrument, stated interest rate | 2.82% |  |
Hawaiian Electric (parent only) | HEI 2.48% senior notes, due 2028 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 30,000 | 0 |
Debt instrument, stated interest rate | 2.48% |  |
Hawaiian Electric (parent only) | HEI 2.98% senior notes, due 2030 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 50,000 | 50,000 |
Debt instrument, stated interest rate | 2.98% |  |
Hawaiian Electric (parent only) | HEI 3.15% senior notes, due 2031 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 51,000 | 0 |
Debt instrument, stated interest rate | 3.15% |  |
Hawaiian Electric (parent only) | HEI 2.78% senior notes, due 2031 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 25,000 | 0 |
Debt instrument, stated interest rate | 2.78% |  |
Hawaiian Electric (parent only) | HEI 3.74% senior notes, due 2051 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 20,000 | $ 0 |
Debt instrument, stated interest rate | 3.74% |  |

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