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FINANCIAL RISK MANAGEMENT - Expected Maturity of Financial Assets and Liablities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents $ 2,234 $ 2,389 $ 2,455
Accounts receivable 239 249  
Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 2,234 2,389  
Accounts receivable 239 249  
Derivative assets 3 2  
Trade and other payables 1,059 1,084  
Debt 6,456 7,989  
Derivative liabilities 32 78  
Other liabilities 511 216  
Liquidity risk | Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Cash and equivalents 2,234 2,389  
Accounts receivable 239 249  
Derivative assets 2 1  
Trade and other payables 1,059 1,084  
Debt 59 143  
Derivative liabilities 30 51  
Other liabilities 30 42  
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 311 533  
Derivative liabilities 2 27  
Other liabilities 231 51  
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 975 997  
Derivative liabilities 0 0  
Other liabilities 64 3  
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 5,111 6,316  
Derivative liabilities 0 0  
Other liabilities $ 186 $ 120