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FINANCIAL RISK MANAGEMENT - Expected Maturity of Financial Assets and Liablities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents $ 3,314 $ 1,571 $ 2,234
Accounts receivable 363 248  
Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 3,314 1,571  
Accounts receivable 363 248  
Derivative assets 0 3  
Trade and other payables 1,155 1,101  
Debt 5,564 5,767  
Derivative liabilities 0 3  
Other liabilities 209 297  
Liquidity risk | Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 3,314 1,571  
Accounts receivable 363 248  
Derivative assets 0 2  
Trade and other payables 1,155 1,101  
Debt 39 43  
Derivative liabilities 0 3  
Other liabilities 55 59  
Liquidity risk | 1 to 3 years      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 0 0  
Accounts receivable 0 0  
Derivative assets 0 1  
Trade and other payables 0 0  
Debt 371 275  
Derivative liabilities 0 0  
Other liabilities 52 80  
Liquidity risk | 3 to 5 years      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 0 0  
Accounts receivable 0 0  
Derivative assets 0 0  
Trade and other payables 0 0  
Debt 13 339  
Derivative liabilities 0 0  
Other liabilities 9 21  
Liquidity risk | Over 5 years      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 0 0  
Accounts receivable 0 0  
Derivative assets 0 0  
Trade and other payables 0 0  
Debt 5,141 5,110  
Derivative liabilities 0 0  
Other liabilities $ 93 $ 137