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FINANCIAL RISK MANAGEMENT - Expected Maturity of Financial Assets and Liablities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents $ 1,571 $ 2,234 $ 2,389
Accounts receivable 248 239  
Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 1,571 2,234  
Accounts receivable 248 239  
Derivative assets 3 3  
Trade and other payables 1,101 1,059  
Debt 5,767 6,456  
Derivative liabilities 3 32  
Other liabilities 297 252  
Liquidity risk | Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 1,571 2,234  
Accounts receivable 248 239  
Derivative assets 2 2  
Trade and other payables 1,101 1,059  
Debt 43 59  
Derivative liabilities 3 30  
Other liabilities 59 30  
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 1 1  
Trade and other payables 0 0  
Debt 275 311  
Derivative liabilities 0 2  
Other liabilities 80 67  
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 339 975  
Derivative liabilities 0 0  
Other liabilities 21 4  
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 5,110 5,111  
Derivative liabilities 0 0  
Other liabilities $ 137 $ 151