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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, 2020 Option $ / shares shares | Dec. 31, 2019 Option $ / shares shares
Number of outstanding share options (shares) |  |
Outstanding, beginning of year | Option | 33,882 | 28,935
Granted | Option | 6,341 | 7,756
Exercised as options for common shares | Option | (804) | (2,688)
Forfeited/expired | shares | (1,046) | (121)
Outstanding, end of year | Option | 38,373 | 33,882
Exercisable, end of year | Option | 26,943 | 21,535
Weighted average exercise price of share options ($ per share) |  |
Outstanding, beginning of year (in dollar per share) | $ 39.70 | $ 38.25
Granted | 38.95 | 42.96
Exercised as options for common shares | 35.73 | 33.37
Forfeited/expired | 39.91 | 42.57
Outstanding, end of year (in dollar per share) | 39.65 | 39.70
Exercisable, end of year (in dollar per share) | $ 39.10 | $ 37.86

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