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Cash flows (Tables) | 9 Months Ended
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Sep. 30, 2025
Supplemental Cash Flow Elements [Abstract] |
Schedule of Supplemental Disclosures of Cash and Noncash Activity |
Nine months ended September 30 |  | 2025 |  | 2024
(in millions) |  |  |  |
Supplemental disclosures of cash flow information |  |  |  |
HEI consolidated |  |  |  |
Activities from continuing operations: |  |  |  |
Interest paid to non-affiliates, net of amounts capitalized |  | $ | 71 |  |  | $ | 84 |
Interest paid on finance lease obligations |  | 29 |  |  | 23 |
Income taxes paid (including refundable credits) |  | 28 |  |  | 30 |
Income taxes refunded (including refundable credits) |  | 4 |  |  | — |
Activities from discontinued operations: |  |  |  |
Interest paid to non-affiliates, net of amounts capitalized |  | — |  |  | 91 |
Income taxes paid (including refundable credits) |  | — |  |  | 4 |
Hawaiian Electric consolidated |  |  |  |
Interest paid to non-affiliates, net of amounts capitalized |  | 53 |  |  | 59 |
Interest paid on finance lease obligations |  | 29 |  |  | 23 |
Income taxes paid (including refundable credits) |  | 39 |  |  | 53 |
Income taxes refunded (including refundable credits) |  | 5 |  |  | — |
Supplemental disclosures of noncash activities |  |  |  |
HEI consolidated |  |  |  |
Activities from continuing operations: |  |  |  |
Property, plant and equipment: |  |  |  |
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) |  | 66 |  |  | 33 |
Right-of-use assets obtained in exchange for finance lease obligations (financing) |  | 51 |  |  | 108 |
Common stock issued (gross) for nonemployee director and executive/management compensation (financing) 1 |  | 2 |  |  | 2 |
Debt assumed by buyer - sale of subsidiaries (financing) |  | 67 |  |  | — |
Activities from discontinued operations: |  |  |  |
Loans transferred from held for investment to held for sale (investing) |  | — |  |  | 29 |
Right-of-use assets obtained in exchange for operating lease obligations (investing) |  | — |  |  | 4 |
Common stock issued (gross) for nonemployee director and executive/management compensation (financing) 1 |  | — |  |  | 1 |
Hawaiian Electric consolidated |  |  |  |
Electric utility property, plant and equipment |  |  |  |
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) |  | 66 |  |  | 33 |
Right-of-use assets obtained in exchange for finance lease obligations (financing) |  | 51 |  |  | 107 |
Capital contribution from parent of a membership interest in an unconsolidated affiliate (financing) |  | 287 |  |  | — |
HEI consolidated (continuing operations) and Hawaiian Electric consolidated |  |  |  |
Estimated fair value of noncash contributions in aid of construction (investing) |  | 5 |  |  | 9 |
Reduction of long-term debt from funds previously transferred for repayment (financing) |  | 47 |  |  | — |
1 The amounts shown represent the market value of common stock issued for nonemployee director and executive/management compensation and withheld to satisfy statutory tax liabilities.

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- References No definition available. + Details
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