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COMMON SHARE CAPITAL (Details) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
COMMON SHARE CAPITAL    
Balance at the beginning of the period $ 4,527.3  
Balance at the end of the period 5,332.6 $ 4,527.3
Total common share capital $ 14,926.2 $ 14,913.4
Common share capital    
COMMON SHARE CAPITAL    
Balance at the beginning of the period (shares) 1,250,229 1,247,004
Issued under share option and restricted share plans (shares) 3,537 3,225
Balance at the end of the period (shares) 1,253,766 1,250,229
Balance at the beginning of the period $ 14,913.4 $ 14,902.5
Issued under share option and restricted share plans 12.8 10.9
Balance at the end of the period 14,926.2 14,913.4
Total common share capital $ 14,926.2 $ 14,913.4