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FINANCIAL RISK MANAGEMENT - Expected Maturity of Financial Assets and Liablities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents $ 5,188 $ 3,314 $ 1,571
Accounts receivable 558 363  
Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 5,188 3,314  
Accounts receivable 558 363  
Derivative assets 40 0  
Trade and other payables 1,458 1,155  
Debt 5,181 5,564  
Derivative liabilities 0 0  
Other liabilities 382 209  
Liquidity risk | Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 5,188 3,314  
Accounts receivable 558 363  
Derivative assets 0 0  
Trade and other payables 1,458 1,155  
Debt 20 39  
Derivative liabilities 0 0  
Other liabilities 31 55  
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 40 0  
Trade and other payables 0 0  
Debt 16 371  
Derivative liabilities 0 0  
Other liabilities 72 52  
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 20 13  
Derivative liabilities 0 0  
Other liabilities 36 9  
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 5,125 5,141  
Derivative liabilities 0 0  
Other liabilities $ 243 $ 93