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Earnings per share and shareholders' equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 20, 2013 | Mar. 19, 2013
Basic |  |  |  |  |  |
Distributed earnings (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.62 | $ 0.62 |  |
Undistributed earnings (loss) (in dollars per share) | $ 0.10 | $ 0.09 | $ 0.13 | $ 0.18 |  |
Earnings Per Share, basic (in dollars per share) | $ 0.41 | $ 0.40 | $ 0.75 | $ 0.80 |  |
Diluted |  |  |  |  |  |
Distributed earnings (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.62 | $ 0.62 |  |
Undistributed earnings (losses) (in dollars per share) | $ 0.10 | $ 0.09 | $ 0.13 | $ 0.18 |  |
Earnings Per Share, diluted (in dollars per share) | $ 0.41 | $ 0.40 | $ 0.75 | $ 0.80 |  |
Antidilutive effect of HEI common stock |  |  |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) |  |  |  | 0 |  |
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) | $ 0.00 |  | $ 0.00 |  |  |
Cash in exchange of physical delivery of shares on settlement | $ 178 |  | $ 178 |  |  |
Delivery of cash on settlement | 8 |  | 8 |  |  |
Underwriting discount included in delivery of cash | $ 7 |  | $ 7 |  |  |
Delivery of net shares on settlement | 282,000 |  | 282,000 |  |  |
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) |  |  | 102,000 |  |  |

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