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COMMON SHARE CAPITAL (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
COMMON SHARE CAPITAL    
Balance at the beginning of the period (shares) 1,247,003,940  
Balance at the end of the period (shares) 1,250,228,821 1,247,003,940
Balance at the beginning of the period $ 4,619.2  
Balance at the end of the period 4,527.3 $ 4,619.2
Total common share capital $ 14,913.4 $ 14,902.5
Common share capital    
COMMON SHARE CAPITAL    
Balance at the beginning of the period (shares) 1,247,004,000 1,245,050,000
Issued under share option and restricted share plans (shares) 3,225,000 1,954,000
Balance at the end of the period (shares) 1,250,229,000 1,247,004,000
Balance at the beginning of the period $ 14,902.5 $ 14,894.2
Issued under share option and restricted share plans 10.9 8.3
Balance at the end of the period 14,913.4 14,902.5
Total common share capital $ 14,913.4 $ 14,902.5