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Cash flows (Tables) | 6 Months Ended
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Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract] |
Schedule of supplemental disclosures of cash and noncash activity |
Six months ended June 30 |  | 2018 |  | 2017
(in millions) |  |  |  |
Supplemental disclosures of cash flow information |  |  |  |  |  |
HEI consolidated |  |  |  |
Interest paid to non-affiliates |  | $ | 45 |  |  | $ | 46 |
Income taxes paid (including refundable credits) |  | 36 |  |  | 21 |
Hawaiian Electric consolidated |  |  |  |
Interest paid to non-affiliates |  | 32 |  |  | 36 |
Income taxes paid (including refundable credits) |  | 35 |  |  | 8 |
Supplemental disclosures of noncash activities |  |  |  |  |  |
HEI consolidated |  |  |  |
Property, plant and equipment |  |  |  |
Estimated fair value of noncash contributions in aid of construction (investing) |  | 5 |  |  | 2 |
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) |  | 42 |  |  | 38 |
Loans transferred from held for investment to held for sale (investing) |  | 1 |  |  | 9 |
Common stock issued (gross) for director and executive/management compensation (financing)1 |  | 4 |  |  | 11 |
Obligations to fund low income housing investments (investing) |  | 6 |  |  | — |
Transfer of retail repurchase agreements to deposit liabilities (financing) |  | 102 |  |  | — |
Unsettled trades to purchase investment securities (investing) |  | 10 |  |  | — |
Hawaiian Electric consolidated |  |  |  |
Electric utility property, plant and equipment |  |  |  |
Estimated fair value of noncash contributions in aid of construction (investing) |  | 5 |  |  | 2 |
Unpaid invoices and accruals for capital expenditures, balance, end of period (investing) |  | 28 |  |  | 36 |
1 The amounts shown represent the market value of common stock issued for director and executive/management compensation and withheld to satisfy statutory tax liabilities.

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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- References No definition available. + Details
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