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Long-term debt (Details) (USD $) |  |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  | 0 Months Ended |  |  | 1 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Special purpose revenue bonds issued on behalf of electric utility subsidiaries | Dec. 31, 2012 Special purpose revenue bonds issued on behalf of electric utility subsidiaries | Mar. 07, 2013 HEI medium-term note 5.25%, due 2013 | Dec. 31, 2013 HEI medium-term note 5.25%, due 2013 | Dec. 31, 2012 HEI medium-term note 5.25%, due 2013 | Dec. 31, 2013 HEI medium-term note 6.51%, due 2014 | Dec. 31, 2012 HEI medium-term note 6.51%, due 2014 | Dec. 31, 2013 HEI senior note 4.41%, due 2016 | Dec. 31, 2012 HEI senior note 4.41%, due 2016 | Dec. 31, 2013 HEI senior note 5.67%, due 2021 | Dec. 31, 2012 HEI senior note 5.67%, due 2021 | Mar. 06, 2013 HEI senior note 3.99%, due 2023 | Dec. 31, 2013 HEI senior note 3.99%, due 2023 | Dec. 31, 2012 HEI senior note 3.99%, due 2023 | Oct. 31, 2013 Special Purpose Revenue Bonds | Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes [Member] Senior notes | Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes Due July, 2020, 3.83% Senior notes | Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes Due December, 2022, 4.45% Senior notes | Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes Due October, 2027, 4.84% Senior notes | Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes Due October, 2043, 5.65% Senior notes | Oct. 03, 2013 Hawaiian Electric Notes, Senior Notes Senior notes | Oct. 03, 2013 Hawaiian Electric, Senior Notes Due December, 2022, 4.45% Senior notes | Oct. 03, 2013 Hawaiian Electric, Senior Notes Due October, 2027, 4.84% Senior notes | Oct. 03, 2013 Hawaiian Electric, Senior Notes Due October, 2043, 5.65% Senior notes | Oct. 03, 2013 Hawaii Electric Light Notes, Senior Notes Senior notes | Oct. 03, 2013 Hawaiian Electric Light, Senior Notes Due July, 2020, 3.83% Senior notes | Oct. 03, 2013 Hawaiian Electric Light, Senior Notes Due December, 2022, 4.45% Senior notes | Oct. 03, 2013 Hawaiian Electric Light, Senior Notes Due October, 2027, 4.84% Senior notes | Oct. 03, 2013 Maui Electric Notes, Senior Notes Senior notes | Oct. 03, 2013 Maui Electric, Senior Notes Due October, 2027, 4.84% Senior notes | Oct. 03, 2013 Maui Electric, Senior Notes Due October, 2043, 5.65% Senior notes | Oct. 03, 2013 4.75%, refunding series 2003A, due 2020 Senior notes | Oct. 03, 2013 5.00%, refunding series 2003B, due 2022 Senior notes | Oct. 03, 2013 5.65%, refunding series 1997A, due 2027 Senior notes | Dec. 31, 2013 Hawaiian Electric Company, Inc. and Subsidiaries
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 1,492,945,000 | $ 1,422,872,000 | $ 1,217,945,000 | $ 1,147,872,000 |  | $ 0 | $ 50,000,000 | $ 100,000,000 | $ 100,000,000 | $ 75,000,000 | $ 75,000,000 | $ 50,000,000 | $ 50,000,000 |  | $ 50,000,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  |  | 5.25% | 5.25% | 6.51% | 6.51% | 4.41% | 4.41% | 5.67% | 5.67% | 3.99% | 3.99% | 3.99% |  |  |  |  |  |  |  | 4.45% | 4.84% | 5.65% |  | 3.83% | 4.45% | 4.84% |  | 4.84% | 5.65% | 4.75% | 5.00% | 5.65% |
Aggregate principal payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 111,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000
2015 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
2016 | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
2017 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
2018 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000
Additional borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refinancing of unsecured debt payable |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 236,000,000 | 14,000,000 | 52,000,000 | 100,000,000 | 70,000,000 | 140,000,000 | 40,000,000 | 50,000,000 | 50,000,000 | 56,000,000 | 14,000,000 | 12,000,000 | 30,000,000 | 40,000,000 | 20,000,000 | 20,000,000 |  |  |  |
Bonds redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 166,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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