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Common Shareholders’ Equity (Details 3) - $ / shares | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 06, 2017 | Apr. 12, 2017 | Dec. 06, 2016 | Apr. 13, 2016 | Dec. 02, 2015 | Apr. 15, 2015 | Dec. 02, 2014
Interim dividend [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of Common Shareholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend paid date | Jan. 05, 2018 | Jan. 06, 2017 | Jan. 08, 2016 | Jan. 09, 2015 |  |  |  |  |  |  |
Dividend per Share | $ 70.0000 | $ 66.0000 | $ 66.0000 | $ 63.0000 | $ 70 |  | $ 66 |  | $ 66 |  | $ 63
Year of dividend | 2017 | 2016 | 2015 | 2014 |  |  |  |  |  |  |
Final dividend [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of Common Shareholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend paid date |  | Apr. 26, 2017 | Apr. 22, 2016 | Apr. 23, 2015 |  |  |  |  |  |  |
Dividend per Share |  | $ 110.32236 | $ 97.47388 | $ 98.78138 |  | $ 110.32236 |  | $ 97.47388 |  | $ 98.78138 |
Year of dividend |  | 2016 | 2015 | 2014 |  |  |  |  |  |  |

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- Definition The date of payment of dividend. + References No definition available. + Details
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- Details
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