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Share-based compensation (Stock options) (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Genesis [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options grated (in shares) | 2,100 |
Equity Incentive Plan 2012 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options grated (in shares) | 0 |
Equity Incentive Plan 2014 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options grated (in shares) | 0 |
Equity Incentive Plan 2006 |  |
Number of options |  |
Options outstanding at beginning of period (in shares) | 140,045 |
Exercised (in shares) | (102,100) |
Options outstanding at end of period (in shares) | 37,945 | [1]
Weighted average exercise price ($) |  |
Options outstanding at beginning of period (in USD per share) | $ / shares | $ 6.02 |
Exercised (in USD per share) | $ / shares | 3.41 |
Options outstanding at end of period (in USD per share) | $ / shares | $ 13.02 | [1]
[1] | Includes 2,100 AER options granted to former Genesis directors and employees at the closing of the amalgamation with Genesis on March 25, 2010. These options were issued pursuant to a separate board resolution, and not under any of the AerCap Holdings N.V. Equity Plans. They have all vested as of December 31, 2017.

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