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Common shares (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Share Capital |
|  | As at June 30, 2018 |  |  | As at December 31, 2017 |
|  | Shares |  |  | $ million |  |  | Shares |  |  | $ million |
All shares are common shares of $2.00 par value each |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized share capital |  |  | 800,000,000 |  |  |  | 1,600 |  |  |  | 800,000,000 |  |  |  | 1,600 |
Issued and fully paid share capital |  |  | 508,763,020 |  |  |  | 1,017 |  |  |  | 508,763,020 |  |  |  | 1,017 |
Treasury shares held by the Company |  |  | (4,244,080 | ) |  |  | (9 | ) |  |  | (4,244,080 | ) |  |  | (9 | )
Outstanding common shares in issue |  |  | 504,518,940 |  |  |  | 1,008 |  |  |  | 504,518,940 |  |  |  | 1,008 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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