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SHARE BASED COMPENSATION - Summary of Stock Option Plans - (Details) shares in Thousands, Option in Thousands | 12 Months Ended
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Dec. 31, 2019 Option $ / shares shares | Dec. 31, 2018 Option $ / shares shares
Number of outstanding share options (shares) |  |
Outstanding, beginning of year | Option | 28,935 | 31,110
Granted | Option | 7,756 | 7,231
Exercised as options for common shares | Option | (2,688) | (7,927)
Forfeited/expired | shares | (121) | (1,479)
Outstanding, end of year | Option | 33,882 | 28,935
Exercisable, end of year | Option | 21,535 | 15,374
Weighted average exercise price of share options ($ per share) |  |
Outstanding, beginning of year (in dollar per share) | $ 38.25 | $ 36.96
Granted | 42.96 | 43.19
Exercised as options for common shares | 33.37 | 35.95
Forfeited/expired | 42.57 | 47.88
Outstanding, end of year (in dollar per share) | 39.70 | 38.25
Exercisable, end of year (in dollar per share) | 37.86 | 36.10
Weighted average share price | $ 40.82 | $ 46.99

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