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Summary of significant accounting policies (Details 3) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Basic |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.24 | $ 1.24 | $ 1.24
Undistributed earnings (loss) (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.39 | $ 0.19 | $ 0.21
Earnings Per Share, basic (in dollars per share) | $ 0.39 | $ 0.49 | $ 0.41 | $ 0.34 | $ 0.14 | $ 0.49 | $ 0.40 | $ 0.40 | $ 1.63 | $ 1.43 | $ 1.45
Diluted |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.24 | $ 1.24 | $ 1.24
Undistributed earnings (losses) (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.38 | $ 0.18 | $ 0.20
Earnings Per Share, diluted (in dollars per share) | $ 0.39 | $ 0.48 | $ 0.41 | $ 0.34 | $ 0.14 | $ 0.49 | $ 0.40 | $ 0.40 | $ 1.62 | $ 1.42 | $ 1.44
Accounts Receivable |  |  |  |  |  |  |  |  |  |  |
Allowance for customer accounts receivable, accrued unbilled revenues and other accounts receivable | $ 2,000,000 |  |  |  | $ 2,000,000 |  |  |  | $ 2,000,000 | $ 2,000,000 |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |
Goodwill | 82,190,000 |  |  |  | 82,190,000 |  |  |  | 82,190,000 | 82,190,000 |
Estimated fair value in excess of book value (as a percent) |  | 60.00% |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | 0 | 0 | 0
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Electric utility revenues |  |  |  |  |  |  |  |  |  |  |
Revenue taxes included in "operating revenues" and in "taxes, other than income taxes" expense |  |  |  |  |  |  |  |  | 266,000,000 | 280,000,000 | 264,000,000
Weighted average AFUDC rate (as a percent) |  |  |  |  |  |  |  |  | 7.60% | 7.60% | 8.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum |  |  |  |  |  |  |  |  |  |  |
Contributions in aid of construction |  |  |  |  |  |  |  |  |  |  |
Contributions amortized period |  |  |  |  |  |  |  |  | 30 years |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum |  |  |  |  |  |  |  |  |  |  |
Contributions in aid of construction |  |  |  |  |  |  |  |  |  |  |
Contributions amortized period |  |  |  |  |  |  |  |  | 55 years |  |
Bank |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Past due period after which the accrual of interest on loans ceases |  |  |  |  |  |  |  |  | 90 days |  |
Loans modified in a troubled debt restructuring |  |  |  |  |  |  |  |  |  |  |
Number of consecutive months of repayment required for loans to be removed from nonaccrual status |  |  |  |  |  |  |  |  | 6 months |  |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |
Goodwill | 82,190,000 |  |  |  | 82,190,000 |  |  |  | 82,190,000 | 82,190,000 |
Bank | Minimum |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Past due unsecured consumer loans, period to reach delinquency status |  |  |  |  |  |  |  |  | 120 days |  |
Bank | Maximum |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Past due unsecured consumer loans, period to reach delinquency status |  |  |  |  |  |  |  |  | 180 days |  |
Stock appreciation rights (SARs) | Common stock |  |  |  |  |  |  |  |  |  |  |
Antidilutive effect of stock appreciation rights (SARs) |  |  |  |  |  |  |  |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) |  |  |  |  |  |  |  |  | 102,000 | 102,000,000 | 0
Market Approach Valuation Technique [Member] |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |
Control premium |  |  |  |  |  |  |  |  | 18.30% |  |
Number of acquisitions used in valuation |  |  |  |  |  |  |  |  | 18 |  |
Period used in control premium |  |  |  |  |  |  |  |  | 2 years |  |
Fair Value Inputs, Control Premium, Observation Events, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  | 100.00% |  |
Market Approach Valuation Technique [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |
Asset value of financial institutions used in comparability | 3,500,000,000 |  |  |  |  |  |  |  | 3,500,000,000 |  |
Market Approach Valuation Technique [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |
Asset value of financial institutions used in comparability | $ 8,000,000,000 |  |  |  |  |  |  |  | $ 8,000,000,000 |  |
Discounted cash flow |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  |  |  |  |  | 8.50% |  |

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