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Earnings per share and shareholders' equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Mar. 20, 2013 | Mar. 19, 2013
Basic |  |  |  |  |  |
Distributed earnings (in dollars per share) | $ 0.31 |  | $ 0.93 |  |  |
Earnings Per Share, Basic and Diluted, Distributed |  | $ 0.31 |  | $ 0.93 |  |
Undistributed earnings (loss) (in dollars per share) | $ 0.18 |  | $ 0.31 |  |  |
Earnings Per Share, Basic and Diluted, Undistributed |  | $ 0.18 |  | $ 0.36 |  |
Earnings Per Share, basic (in dollars per share) | $ 0.49 | $ 0.49 | $ 1.24 | $ 1.29 |  |
Diluted |  |  |  |  |  |
Distributed earnings (in dollars per share) | $ 0.31 |  | $ 0.93 |  |  |
Undistributed earnings (losses) (in dollars per share) | $ 0.17 |  | $ 0.30 |  |  |
Earnings Per Share, diluted (in dollars per share) | $ 0.48 | $ 0.49 | $ 1.23 | $ 1.29 |  |
Antidilutive effect of HEI common stock |  |  |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) |  |  |  | 0 |  |
Earnings Per Share, Basic and Diluted |  | $ 0.49 |  | $ 1.29 |  |
Equity forward transaction |  |  |  |  |  |
Public offering related to equity forward transaction (in shares) |  |  |  |  |  | 6,100,000
Closing price of common stock (in dollar per share) |  |  |  |  |  | $ 27.01
Offering related to underwriters exercising their over-allotment option under equity forward transaction (in shares) |  |  |  |  | 900,000 |
Shares borrowed by forward counterparty from third party | 7,000,000 |  | 7,000,000 |  |  |
Sale of common stock related to equity forward transaction (in dollars per share) | $ 26.75 |  | $ 26.75 |  |  | $ 26.75
Underwriting discount (in dollars per share) | $ 1.00312 |  | $ 1.00312 |  |  |
Forward sale price (in dollars per share) | $ 25.74688 |  | $ 25.74688 |  |  |
Initial fair value (in dollars per share) | $ 0 |  | $ 0 |  |  |
Cash in exchange of physical delivery of shares on settlement | $ 175 |  | $ 175 |  |  |
Delivery of cash on settlement | 6 |  | 6 |  |  |
Underwriting discount included in delivery of cash | $ 7 |  | $ 7 |  |  |
Delivery of net shares on settlement | 212,000 |  | 212,000 |  |  |
Stock appreciation rights (SARs) | Common stock |  |  |  |  |  |
Antidilutive effect of HEI common stock |  |  |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) |  |  | 164,000 |  |  |

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