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Retirement benefits - ABO and PBO in Excess of Plan Assets (Details) - Pension benefits - USD ($) $ in Billions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plans - ABOs | $ 1.7 | $ 2.3
Defined benefit plans with PBOs in excess of plan assets |  |
PBOs | 1.8 | 2.5
Fair value of plan assets | 1.7 | 2.2
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plans - ABOs | 1.5 | 2.1
Defined benefit plans with PBOs in excess of plan assets |  |
PBOs | 1.7 | 2.5
Fair value of plan assets | $ 1.7 | $ 2.1

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