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Cash flows (Tables) | 6 Months Ended
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Jun. 30, 2016
Supplemental Cash Flow Elements [Abstract] |
Schedule of supplemental disclosures of cash and noncash activity |
Six months ended June 30 |  | 2016 |  | 2015
(in millions) |  |  |  |
Supplemental disclosures of cash flow information |  |  |  |  |  |
HEI consolidated |  |  |  |
Interest paid to non-affiliates |  | $ | 43 |  |  | $ | 41 |
Income taxes paid |  | 14 |  |  | 35 |
Income taxes refunded |  | 45 |  |  | 55 |
Hawaiian Electric consolidated |  |  |  |
Interest paid to non-affiliates |  | 31 |  |  | 30 |
Income taxes paid |  | — |  |  | 9 |
Income taxes refunded |  | 20 |  |  | 12 |
Supplemental disclosures of noncash activities |  |  |  |  |  |
HEI consolidated |  |  |  |
Common stock dividends reinvested in HEI common stock 1 |  | 11 |  |  | — |
Real estate transferred from property, plant and equipment to other assets held-for-sale (investing) |  | — |  |  | 5 |
Obligations to fund low income housing investments (operating) |  | 6 |  |  | — |
HEI consolidated and Hawaiian Electric consolidated |  |  |  |
Additions to electric utility property, plant and equipment - unpaid invoices and accruals (investing) |  | (32 | ) |  | (12 | )
1 The amounts shown represent common stock dividends reinvested in HEI common stock under the HEI Dividend Reinvestment and Stock Purchase Plan (DRIP) in noncash transactions. From January 6, 2016, HEI satisfied the share purchase requirements of the DRIP through new issuances of its common stock. In 2015, HEI satisfied such requirements with cash through open market purchases of its common stock.

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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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