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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2018
SHARE CAPITAL. |
Schedule of share repurchase activities |
($ millions except as noted) |  | 2018 |  | 2017 |
Share repurchase activities (thousands of common shares) |  |  |  |  |
| Shares repurchased |  | 64 426 |  | 33 154 |
Amounts charged to |  |  |  |  |
| Share capital |  | 1 040 |  | 536 |
| Retained earnings |  | 2 013 |  | 877 |
Share repurchase cost |  | 3 053 |  | 1 413 |
Average repurchase cost per share |  | 47.38 |  | 42.61 |
Schedule of liability for share repurchases |
($ millions) |  | December 31 2018 |  | December 31 2017 |
Amounts charged to |  |  |  |  |
| Share capital |  | 111 |  | 97 |
| Retained earnings |  | 152 |  | 180 |
Liability for share purchase commitment |  | 263 |  | 277 |

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- Definition The disclosure of repurchase and reverse repurchase agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_10_e&doctype=Standard -URIDate 2018-03-16 + Details
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