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Recent Accounting Pronouncements (Tables) | 3 Months Ended
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Mar. 31, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |
Schedule of new accounting pronouncements and changes in accounting principles | The table below summarizes the impact to the prior period financial statements of the adoption of ASU No. 2015-03:
| (in thousands) | As previously filed | Adjustment from adoption of ASU No. 2015-03 | As currently reported
| December 31, 2015 |  |  |
| HEI Consolidated Balance Sheet and Note 3 - Segment financial information (Total assets) |  |  |
| Other assets | $ | 488,635 |  | $ | (8,178 | ) | $ | 480,457 |
| Total assets and Total liabilities and shareholders’ equity | 11,790,196 |  | (8,178 | ) | 11,782,018 |
| Long-term debt, net-other than bank | 1,586,546 |  | (8,178 | ) | 1,578,368 |
| Total liabilities | 9,828,263 |  | (8,178 | ) | 9,820,085 |
| Hawaiian Electric Consolidated Balance Sheet and Note 3 - Segment financial information (Total assets) |  |  |
| Unamortized debt expense | 8,341 |  | (7,844 | ) | 497 |
| Total other long-term assets | 908,327 |  | (7,844 | ) | 900,483 |
| Total assets and Total capitalization and liabilities | 5,680,054 |  | (7,844 | ) | 5,672,210 |
| Long-term debt, net | 1,286,546 |  | (7,844 | ) | 1,278,702 |
| Total capitalization | 3,049,164 |  | (7,844 | ) | 3,041,320 |
| Note 4 - Hawaiian Electric Consolidating Balance Sheet |  |  |
| Hawaiian Electric (parent only) |  |  |
| Unamortized debt expense | 5,742 |  | (5,383 | ) | 359 |
| Total other long-term assets | 662,430 |  | (5,383 | ) | 657,047 |
| Total assets and Total capitalization and liabilities | 4,481,558 |  | (5,383 | ) | 4,476,175 |
| Long-term debt, net | 880,546 |  | (5,383 | ) | 875,163 |
| Total capitalization | 2,631,164 |  | (5,383 | ) | 2,625,781 |
| Hawaii Electric Light |  |  |
| Unamortized debt expense | 1,494 |  | (1,420 | ) | 74 |
| Total other long-term assets | 130,749 |  | (1,420 | ) | 129,329 |
| Total assets and Total capitalization and liabilities | 955,935 |  | (1,420 | ) | 954,515 |
| Long-term debt, net | 215,000 |  | (1,420 | ) | 213,580 |
| Total capitalization | 514,702 |  | (1,420 | ) | 513,282 |
| Maui Electric |  |  |
| Unamortized debt expense | 1,105 |  | (1,041 | ) | 64 |
| Total other long-term assets | 115,148 |  | (1,041 | ) | 114,107 |
| Total assets and Total capitalization and liabilities | 831,201 |  | (1,041 | ) | 830,160 |
| Long-term debt, net | 191,000 |  | (1,041 | ) | 189,959 |
| Total capitalization | 459,725 |  | (1,041 | ) | 458,684 |

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