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SHARE CAPITAL (Tables) | 12 Months Ended
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Dec. 31, 2019
SHARE CAPITAL. |
Schedule of share repurchase activities |
($ millions except as noted) |  | 2019 |  | 2018 |
Share repurchase activities (thousands of common shares) |  |  |  |  |
| Shares repurchased |  | 55 298 |  | 64 426 |
Amounts charged to |  |  |  |  |
| Share capital |  | 905 |  | 1 040 |
| Retained earnings |  | 1 369 |  | 2 013 |
Share repurchase cost |  | 2 274 |  | 3 053 |
Average repurchase cost per share (dollars) |  | 41.12 |  | 47.38 |
Schedule of liability for share repurchases |
($ millions) |  | December 31 2019 |  | December 31 2018 |
Amounts charged to |  |  |  |  |
| Share capital |  | 65 |  | 111 |
| Retained earnings |  | 103 |  | 152 |
Liability for share purchase commitment |  | 168 |  | 263 |

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